This monitor comes with a 2.4" color screen that connects to its camera over a secure, interference-free connection, providing you with video up to 900 feet away. It boasts a two-way talk system and night vision, as well as several extra features like temperature monitoring, voice-activation mode, 2x zoom and more. The manufacturer doesn’t specify how long the battery on this video baby monitor lasts, but reviewers say you can get around six hours of continuous use from it.
Wi-fi baby monitors are the latest innovation in high-tech baby gear, and they’re super convenient. A baby monitor with wi-fi allows you to connect anywhere that has Internet service or Bluetooth capability, and the monitor can often be controlled remotely using a smartphone or computer. This functionality makes the wi-fi baby monitor great for travelling (unless you’re heading to a remote location). Safety tip: No matter what connection you use, be sure that it’s a secure connection in order to prevent your monitor from being hacked.
The Motorola MBP36S digital video baby monitor features wireless 2.4 GHz FHSS technology, which offers a reliable connection for better range and less chance of a dropped signal. It is equipped with multiple camera viewing with picture-in-picture and auto-switch screen options, allowing you to add additional cameras and keep an eye on the entire family in up to 4 rooms of your home. (Model: MBP36SBU, sold separately.) The superior wireless range of the MBP36S allows you to stay connected to your baby up to 590 feet away.
Rest easy when you keep an eye on your child while they're sleeping; a video baby monitor makes it easy to check in on your little one without disturbing their slumbers. Top quality units allow you to pan, tilt and zoom in on whatever catches your eye plus they feature invisible night vision LED lights or infrared night vision for keeping an eye on things in low light levels. A baby monitor with camera allows you to keep tabs on your child, pets and caregivers; a wide view monitor enables you to see more of baby's room. Use a 2–way audio wireless baby monitor to see, hear and clearly communicate as if you are in the same room with your baby; it is ideal for soothing your little one even when you are not present. A digital baby monitor is the perfect baby shower or new baby gift and always a Baby Registry favorite. Enjoy peace of mind and make sure your baby sleeps peacefully through the night because when your little one sleeps well, you will too.
If you aren't interested in having a video baby monitor, the VTech DM221 is the very best audio-only monitor you can buy. You can listen in on your baby or get vibration and light-based alerts when the monitor is in silent mode. The five LED lights indicate the level of sound so you can tell whether your baby is cooing quietly or shrieking for mom and dad.
Video products add the element of visual peeking on your baby, so you can see if your baby is crying but calming down without you or if you need to make your way to their side. Most video products work well in the dark and have adequate sound so you can see and hear what is happening in the room. Some options are dedicated with a camera that talks to a parent unit, like the Levana Lila while others use your Wi-Fi to send information from the camera to your personal device like the Nest Cam. Wi-Fi options are great for larger houses where range could be an issue, and it's also nice for away from home monitoring. While video images are not mandatory for getting a good night's sleep, they do provide more information that can help you determine your little one's needs before you get out of bed. With the price of video products being lower than ever, it is no longer considered a luxury product and many parents are choosing this style over sound only products. However, proceed with caution! Spying on your newborn can be addictive and lead to less sleep which defeats the purpose of a getting a monitoring device in the first place.
This is a powerful solution for the relatively computer savvy parents who want flexibility, accessibility, and convenience. This is not just a great baby monitor, this is a wireless video camera that can be placed anywhere and will communicate with computers and smart phones; many people even use it as a home security camera for its ease of use and placement, high-quality video, and as a monitor with night vision it is pretty unsurpassed. Install the Dropcam App and view your baby through your cell phone no matter where you are, or use it as a powerful security camera for when you're traveling or out of the house. Want to check in on the babysitter while you're out on date night to make sure your baby is napping on time? Want to move the camera to monitor the dog or your home while you're away? Easy, and with the 130-degree wide angle lens, you can place it in even small rooms and maintain a good field of view. If you're away from home, you can also set it up to alert you to any movement: it will send an alert to your phone (or an email) along with a photo of what's going on. Like many baby-oriented video monitors, it also supports two-way communication with a built-in microphone and speaker, has 8x digital zoom, and has great night vision. It also has 1080p quality video, day and night. But it's also a bit expensive for a camera-only system, coming in at about $165. This is a powerful and flexible system that has a very high-quality digital video color and night vision camera, a wide field of view, access to cloud computing, and tons of convenient bells and whistles. This is not your mom's baby monitor. However, there are some requirements here: you need wireless internet in your home, and it needs to be rather high speed to support streaming high-quality video and audio feeds. You also will need to load an app onto your phone (iPhone or Android) or a software package onto your computers (Windows or Macs) in order to access the device. If you ask us, this is one of the best and most flexible solutions for baby monitoring. It's a bit lower on our list because it's not technically a baby monitor so it doesn't include things like sleep mode (turn on only in response to noise), and of course there is no dedicated bed-side monitor for it. It's an all-purpose camera that you can place anywhere and use as a baby monitor when needed. We also don't like that you need to subscribe to the Nest Aware for $10/month if you want to remove annoying banner ads on the app or software package. After paying $165+ for this, you would think the app would be included without annoying ads?
Sound activation is a feature we think parents should consider. This feature creates a quiet monitor unless the baby is actively making noise and translates to parents potentially getting more sleep because they aren't kept awake by ambient noises. Having sound activation means you only hear what you want to. This feature can be found in dedicated and Wi-Fi monitors.

Security is one reason Stanislav personally uses an RF monitor (like our pick) with his own daughter. He added that even that is not completely secure—“there are absolutely ways to break into a signal with radio frequency,” he said. But, noting that you have to be physically close to the house, and have the motive and ability to do it, he says it’s “a very small risk to your average parent.” In addition to the actual risks of a Wi-Fi monitor, there’s a perception that they’re vulnerable—this suspicious tone comes up often in many conversations with parents about monitors, with statements like “we’ve all heard the horror stories”2 coloring the whole discussion and suggesting, to us, that most people are really put off by the vulnerability.

Child Safety: We care a lot about the safety and well-being of your babies, and our baby monitor reviews are no exception to that rule. Most of the safety issues with baby monitor systems revolve around the parent's due diligence: secure the wires out of reach and out of sight from your baby, make sure you put the camera out of reach (especially when you're mounting to the rail of a crib), and always keep them away from water and a running humidifier. In addition to these basic safety tips, the newer heart rate monitoring, breathing monitoring, and movement monitoring systems can add confidence to parents worried about their baby sleeping in a different room. A good example of a baby monitor with heart rate monitoring is the Owlet Smart Sock that can track heart rate and blood oxygenation levels, and stream that information to an app on your smart phone. Of course, don't be too confident because these devices are not hospital- or laboratory-grade monitoring systems, so keep that in mind.

When shopping for a video monitor, note that you'll pay a substantial premium over audio-only monitors, which cost around $30 to $50. You'll need to decide if the extra money for video viewing is worth it, though parents may appreciate the ability to glance at a smartphone app or handheld monitor to visually check in on their sleeping child instead of opening a door and potentially waking up their baby.

To save on battery life, some audio/video models only turn on when the baby makes an unusual motion or sound. Some models come with a motion-detector pad that fits under the crib sheet. This type of motion sensor is intended to prevent SIDS. Sensitive enough to detect changes in breathing, an alarm sounds if there is no movement after 20 minutes. However, if the baby simply rolls off the pad, the alarm may sound.
By default, Arlo Baby records in 720p resolution, though you can switch to 1080p if you prefer. You can also adjust the field of view and fine-tune notifications on what triggers an alert. You do have to position the camera manually, however, and the gap between getting a notification on our phone and actually being able to jump to live video was a little laggy for our tastes.

However, a closer look at the flaws noted in the iBaby’s negative reviews—currently, one-star reviews make up roughly 25 percent of the total—pushed us even further toward the Infant Optics as the one we’d choose for a similar price. The app is pretty poorly done. You may lose a connection even with a perfect Wi-Fi signal. Some people report never being able to connect to it at all. The plug on this unit is an odd 2-piece design that is unnecessarily complicated (but it can be fairly easily replaced with another basic 5V charger if you want). All told, the M6S comes close to the functionality of the Infant Optics pick in some ways, and the ability to access the camera remotely is a huge plus, but all the other drawbacks are too much to overlook.
Most dual monitors come with split- or even quad-screen viewing, and the DBPower Digital Sound Activated baby monitor does just that. This model supports up to four cameras, allowing you to monitor four rooms at once. With features like remote pan/tilt/zoom, room temperature monitoring and alert, two-way communication and manual or automatic video recording, we found the DBPower to be the best dual baby monitor.
Long Range: Monitors that don’t connect to WiFi have a limited range, usually around 600 to 1,000 feet. While this is large enough for all but the biggest houses, we asked our testers to find out how far they could wander away — and how many walls they could put between them and the baby unit — before they went out of range, as well as to report back on what happened when they did. Sometimes there was an alarm or a notification, but other times the screen simply froze.
We were also disappointed that the Angelcare’s parent unit lacks an out-of-range warning. If you’re in the backyard or basement and the monitor disconnects, it’s not clear whether you’re looking at a napping baby or a frozen screen. Still, it beat out the Baby Delight for sound and video quality and offers a few customizable features: You can adjust the volume on the baby unit as well as the parent unit, and set up timed alarms and temperature alerts.
It should come as no surprise that we selected Nanit as the best baby monitor overall—after all, it was the winner of The Bump Best of Baby Awards this year. Nanit gives you both a clear, unobstructed view of baby thanks to the over-the-crib mount as well as sleep insight reports and nightly sleep scores via an app. You not only see how baby sleeps, but learn how to help baby sleep better.
The HelloBaby might be a standard monitor, but it excels at the basics. It scored better than some of the more expensive WiFi monitors in picture clarity, and was hands-down the easiest to use. Just open the box, plug in the two devices, and you’re ready to go. No difficult packaging to tear through, and no account setup or device pairing necessary. Our testers had it up in running in less than 3 minutes each time.
The Vtech DM221 offers the features you need, coupled with the best sound clarity in our review of sound products. The DM221 comes with easy to set sound activation and adjustable mic sensitivity to help create a peaceful environment for a quality night's sleep with a parent device that only makes a peep when your little one does. The DM221's parent unit talk to baby feature sounds natural on the baby's side so your infant won't be alarmed by a robotic or static sound found in some of the competition. This unit is a budget-friendly choice that will work for almost any family.

All of the products in our review have features for convenience and overall function, but some also offer features for fun or additional information. All of the products have night vision with sensors for automatic adjustment with light changes, and all offer 2-way communication with baby through the camera. Some of them come with lullabies, and others have nifty temperature and humidity sensors. Overall, whatever you might be looking for, or never knew existed but now want, can probably be found in the products we tested.

Using the buttons, you can swivel the DXR-8's camera (so you can eyeball more of the room) and zoom in close. It actually comes with two interchangeable lenses – a standard and a zoom lens – and you can also buy a separate Infant Optics Wide Angle Lens (Est. $12), all of which can be used with the zoom button. This gives you lots of flexibility when deciding where to mount your camera, Baby Bargains points out. "Depending on the configuration of your nursery, your only option may be to put the camera on a dresser across from the crib -- then the normal lens might do. But if you mount the camera on a wall above the crib, the zoom lens might be better." Later, if you use the monitor in a toddler's room or playroom, the wide-angle lens might be the best choice.
We wanted to recommend a less expensive video monitor, but at any price notably lower than our pick, every product we tried had such serious problems—usually, poor video quality and ongoing connection issues—that we feel a higher end audio-only monitor offers a much better value for a limited budget. The VTech DM221 audio monitor is the best choice in the category—it’s consistently a best seller at multiple retailers, with strong reviews (four out five stars over 4,703 reviews on Amazon) and similarly high ratings at Walmart, Target, and BuyBuy Baby.
Will Greenwald has been covering consumer technology for a decade, and has served on the editorial staffs of CNET.com, Sound & Vision, and Maximum PC. His work and analysis has been seen in GamePro, Tested.com, Geek.com, and several other publications. He currently covers consumer electronics in the PC Labs as the in-house home entertainment expert... See Full Bio
Ease of setup and installation factored heavily into our ratings, including whether an account needed to be created and if there were any extra subscription fees necessary. Each unit had cords protruding out of its back, so design wasn't much of a factor in my choice, though parents should take care to keep dangling cords and wires away from their children's reach when setting up a monitor.

If initial impressions mean anything, this is definitely one of the biggest bang-for-the-buck baby monitors on the market. It has some fantastic features, and is offered at a great price point at around $70! Here are some of the best features: first, it has very clear daytime video and crystal clear sound. Using 2.4Ghz communications, like most others on this list, it does a great job connecting, staying connected, and providing superb sound quality. It also is expandable with additional cameras - up to 4 additional cameras to be exact, which means you can really get one of these everywhere. Need one in the playroom, nursery, by the bassinet? Having up to 4 cameras connected is awesome, and the base station provides the easy ability to switch which camera you're looking at. Of course, it only comes with one out of the box, but you can buy extra cameras for about $40 each. We also liked that there is no complicated setup like with some of the IP cameras on this list, which means that there is no connecting to your internet router, or trying to get a phone app to connect. Of course, that also means you can only watch from the base station, not on your phone. About that base station. You can control whether you want digital video and sound, or sound only, and you can also remotely zoom in on your baby as needed (only 2 zoom levels though), but you cannot remotely pan or tilt the camera. There is a 2-way intercom (twoway talk) so you can talk to baby, or play one of the included lullabies. With the screen on, we were able to get the base station's battery to last for about 7 hours, and with just sound the battery lasted for about 11 hours. So definitely long enough for nap times during the day! Like many of the other ones on this list, you can put it into standby mode and have it voice activate automatically when the camera's microphone hears something in the room (like a fussy baby). We thought this feature worked really well and wasn't overly-sensitive and false alarming all night, which could get really annoying. So there are a lot of things to love about this baby video monitor. With such a low price, the feature list is obviously limited. We also thought the nighttime video quality really left something to be desired. We kept trying to increase the brightness to help, but it still was pretty poor relative to other units on this list. Finally, when we first reviewed this system we purchased 3 of them. After 1.5 years, only 1 of them is still working perfectly, 1 of them is a bit glitchy from time to time, and the other one had a screen failure. So we see some reliability and consistency issues with these baby video monitors, and that's the primary reason that it's not higher up on our list. In any event, we do recommend this camera, especially given the overall bang for the buck. But given how cheap it is, don't expect any miracles, or to be buying something to last you until you have grandchildren!
As a parent, your baby’s health and safety are of paramount importance. Therefore, you and other parents may use a baby monitor to make sure that your kids are safe and sound. There are many baby monitor options available including those from brands such as Samsung and Motorola, so it is important to know what features these models have to make the right decision for your family.

Beyond security, Wi-Fi monitors have other disadvantages. In our tests, connectivity was more of an issue with Wi-Fi monitors than it was with RF monitors. We tested our Wi-Fi monitors on two separate routers and consistently had problems—we’d often lose the connection some time in the night and not even realize that the monitor had disconnected until morning. This happened with all three Wi-Fi models we tested. We never really felt confident relying on any of the connected monitors overnight, despite the fact that the modem and router were literally on the other side of a wall from the monitor. Other owners (like this one) have had the same issues.
For parents who want to monitor their baby’s cries from the office, or the gym, or Tahiti, the BB-8-looking iBaby M6S syncs right up to your house Wi-Fi connection ⏤ so instead of using a dedicated handheld receiver, you watch all the action on a smartphone app. It offers impressive 1080p HD video (with record function), a 360-degree view with 110-degree tilt, and an array of high-tech sensors including motion, sound, in-room temperature, air quality, and humidity. The only thing it seemingly won’t do is fix your X-Wing fighter. Although it makes up for it with night vision, two-way talk, and 10 programmed lullabies and bedtime stories, to which you can even add your own voice.
Baby's exposure could potentially be even lower if parents place the camera on a wall at least 15 feet from baby (a distance still good for night vision to work properly with most monitors). Given the sensitivity of baby's developing systems we recommend placing the monitor as far away from the baby as possible while still being able to utilize the night vision as intended and see baby's face to determine if they are awake or sleeping at a glance. For most of the products, this distance is between 10-15 feet from the baby.

Some good things about this model set it apart from competitors. The iBaby connects when you simply plug in your phone via a USB port on the camera body and grant permission for the monitor to access your wireless settings. The competitors make you enter a router’s network key—certainly doable, but not as easy as the iBaby. With 360-degree pan and 110-degree tilt motion, the iBaby can technically see more of the room than our Infant Optics pick—although its bulbous shape is a little harder to arrange than the pick’s simple wall-mount or stand-up base. The M6S model’s video quality and night vision were on a par with that of our former runner-up, the Samsung SEW3043 BrightView HD (but those results will vary with the quality of your Internet connection and your device’s display). The audio from the camera can play in the background on your phone, so you don’t have to keep the app open at all times.


The Samsung SEW-3043W BrightView HD's primary advantages over our pick are a larger, crisper display and a sleeker-looking package overall. But it is not our pick because its main disadvantage—a slow and unresponsive touchscreen—is such an annoying flaw that we're sure you'd prefer our pick's reliable tactile controls. The Samsung also falls short of our pick on battery life and because of other long-term battery and charging issues. On many other measures, the two monitors came out more or less even.
To test connectivity, we put the handheld unit and the camera in neighboring rooms with 30 feet between them. We looked for lag, choppiness, and changes in the video or sound quality. While we rated it separately, we also did tests to estimate each baby cam’s maximum indoor range. Each camera we tested has a range of 100 feet or more, which is enough for an average-size home.
Using the buttons, you can swivel the DXR-8's camera (so you can eyeball more of the room) and zoom in close. It actually comes with two interchangeable lenses – a standard and a zoom lens – and you can also buy a separate Infant Optics Wide Angle Lens (Est. $12), all of which can be used with the zoom button. This gives you lots of flexibility when deciding where to mount your camera, Baby Bargains points out. "Depending on the configuration of your nursery, your only option may be to put the camera on a dresser across from the crib -- then the normal lens might do. But if you mount the camera on a wall above the crib, the zoom lens might be better." Later, if you use the monitor in a toddler's room or playroom, the wide-angle lens might be the best choice.
The interface on the monitor, aka the parent unit, is basic, simple, and intuitive, while many of its competitors have awkward controls. When panning and tilting the camera, for example, the Infant Optics responds immediately and can move in very small increments. The text on the menu displays look like something off an old Motorola RAZR, but the commands are easy to interpret and less confusing than those of some competitors. A group of four buttons makes it easy to pull up the menu and make a change (to the volume, say) without losing sight of the image on the screen. Other nice minor touches, like a display that constantly notes the temperature in the baby’s room, appear on this model but not on all of its competitors. This is not a touchscreen, but frankly, if you’ve ever used an iPhone, you’ll find the touchscreens on most baby monitors to be sorely substandard.
Surprisingly, there are low-cost options to be found in the video monitors, some with prices similar to or better than their sound counterparts. These great buys include dedicated and Wi-Fi cameras for the basic and more tech-savvy parents alike. Consider the Best Value Levana Lila as a no-nonsense option that anyone can easily use with a price under $100. Or the LeFun C2 720P Wi-Fi with a list price of $70 and video images good enough to get the job done. If you have a higher budget, and find value in products that will last for years to come, the Nest Cam Indoor Wi-Fi has a list price around $200, but for the money, you can use it for years in multiple capacities outside baby monitoring, including security and a nanny cam. With awesome products like these, it is easy to see why video monitors have gained in popularity in recent years.
With more than 24,000 Amazon reviewers giving this monitor a near five-star rating, we’re proud to include the Infant Optics DXR-8 video baby monitor on our list of best baby monitors. Parents rave about its crystal-clear picture in both light and darkness, and the interchangeable wide-angle lens for larger viewing areas (sold separately). Not only that, the DXR-8 has the ability to pan and zoom across baby’s room without parents having to enter the room and move or adjust the camera. We think these features make the Infant Optics DXR-8 the best video baby monitor.

We took these criteria into consideration, factored in user feedback and reviews from across the Web, and eventually narrowed the list to eight cameras for testing. We used each camera for several months, taking notes on the interface and any difficulties we ran into. We connected each model to multiple routers, and used each from various distances and through walls to test range. We also ran each monitor from a full charge down to zero to check battery life. Finally, we evaluated each monitor's night vision in dark environments. Read more about our tests in our full guide to baby monitors.

Before buying or registering for a baby monitor (or any wireless product), be sure you can return or exchange it in case you can't get rid of interference or other problems. If you receive a monitor as a baby-shower gift and know where it was purchased, try it before the retailer's return period ends. Return policies are often explained on store receipts, on signs near registers, or on the merchant's website. But if the return clock has run out, don't feel defeated. Persistence and politeness will often get you an exception to the policy. Keep the receipt and the original packaging.
There are a few things you can demand from a decent HD video baby monitor, like a crystal clear image and good night vision capabilities. And there are things you can expect of a good Wi-Fi-enabled monitor, like easy remote access from a smart device with real-time streaming audio and video. Then there are things you might hope for from a baby monitor, like two-way talk and solid battery life.
Angelcare AC300; Angelcare AC401; Angelcare AC403; Angelcare AC420; Angelcare AC601; Angelcare AC701; Apple Cloud Baby Monitor; BabyMoov Easy Care Baby Monitor; BabyMoov Expert Care Audio Baby Monitor; BabyMoov Premium Care Audio Baby Monitor; BabyMoov Simply Care Baby Monitor; Babysense 5s Infant Movement Monitor; MonBaby Smart Button Baby Monitor; Motorola MBP16; Motorola MBP160; Motorola MBP161TIMER; Owlet Smart Sock 2; Philips Avent SCD-560 DECT Baby Monitor; Philips Avent SCD501; Philips Avent SCD570 DECT Baby Monitor; Safety 1st Crystal Clear Audio Monitor; Safety 1st Sound Moments Audio Monitor; Safety 1st Sure Glow Audio Baby Monitor; Samsung SEW-2001W; Samsung SEW-2002W; Snuza Go Baby Monitor; Snuza HeroSE Baby Movement Monitor; Snuza PICO Baby Monitor; Summer Infant Babble Band; Summer Infant Baby Wave Deluxe Digital Audio Monitor; Summer Infant Baby Wave Digital Audio Monitor; VTech DM111 Safe & Sound Digital Audio Baby Monitor; VTech DM222 Digital Audio Baby Monitor with Glow-on-the-Ceiling Night Light; VTech DM223 Digital Audio Monitor; VTech DM225 Digital Audio Monitor; VTech DM271 Digital Audio Monitor; VTech Safe & Sound DM221; VTech Teddy Bear Digital Audio Baby Monitor with Night Light;
A baby monitor, also known as a baby alarm, is a radio system used to remotely listen to sounds made by an infant. An audio monitor consists of a transmitter unit, equipped with a microphone, placed near to the child. It transmits the sounds by radio waves to a receiver unit with a speaker carried by, or near to, the person caring for the infant. Some baby monitors provide two-way communication which allows the parent to speak back to the baby (parent talk-back). Some allow music to be played to the child. A monitor with a video camera and receiver is often called a baby cam.
Think about the size of your home and your daily routine when deciding which brand/model to buy. If you'll be making calls during nap time, for example, look for monitors with lights that let you know when your baby is awake. Of course you can accomplish the same thing by turning down the sound on a video monitor, but lights are more likely to catch your eye.
The audio is quite good as well, with very little distortion. As with other Wi-Fi video baby monitors, there is lag as the video stream travels through distant servers before reaching your smartphone. In our tests, the SCD860 had good results one moment and issues shortly after. This is one of the reasons we gave it a low score for connection quality. A few of our testers had trouble setting up this baby camera using the smartphone app. The camera doesn't work without a wireless connection, unlike traditional video baby monitors that use a handheld receiver. The app is easy to use, and it lets you set up push notifications and adjust the sound sensitivity. We had a few connection issues independent of our Wi-Fi connection, which could cause concern. For a time, we had no connection, so we didn't know what was going on in the other room. This monitor lets you track the temperature and humidity in your baby's room and has a nightlight with multiple light color options. If your baby is upset, you can use the app to talk to them or play one of the 10 lullabies through the camera's speaker. The Philips Avent Smart baby monitor SCD860 has a two-year warranty, which is the longest of all the models we tested.
It uses 2.4GHz FHSS technology that offers a private connection between the monitor in your baby's room and the dedicated viewer in your hand. The FHSS connection should minimize interference, and most reviewers say the audio is clear. In BabyGearLab's testing, the reviewer found that the Phillips AVENT had the best audio signal of any of the monitors it tested.
Baby monitors are just one way to keep track of your little one. For newborns, the Snoo Smart Sleeper is a bed that gently rocks your baby for better sleep, and connects to an app on your phone that lets you receive alerts when your little one needs attention. The Owlet Smart Sock 2, meanwhile, is a connected pulse oximeter that allows you to check on your baby's vitals any time through an app, and will notify you automatically if there's a problem. The Sproutling from Fisher Price is a motion and heart rate sensor that straps to the back of your baby's calf and collects data while he or she sleeps.
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