There are two basic types: audio and video/audio. Some are analog, others are digital. All monitors operate within a selected radio frequency band to send sound from a baby's room to a receiver in another room. Each monitor consists of a transmitter (the child/nursery unit) and one or more receivers. Prices range from about $25 to $150 for audio monitors and about $80 to $300 for audio/video monitors.
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.
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.
This unit only works until little ones can roll or crawl. It can be uncomfortable for some babies or ineffective if little ones are too small or their diapers don't fit well. We worry parents will rely on this kind of device to prevent SIDs and caution you that there is no evidence that it does or can prevent the incidence of SIDs. However, if you want to know when your little one is moving at a predictable rate, and knowing may help you sleep better, then the Snuza could be the right option for you that won't break the bank or require adjustments to your nursery.
A big screen, a camera that zooms and a built-in nightlight make the In View monitor a great pick when you’re on a budget. The monitor also offers all the standard features: low-battery and out-of-range indicators, sound-activated lights and rechargeable batteries for the handheld monitor. Use the camera as a tabletop or mounted on the wall. And if you plan on having a big family, the monitor works with up to four cameras.