For the parent devices of dedicated monitors, the battery life ranged anywhere between 6.75 and 12.75 hours. The Wi-Fi options are harder to gauge given that the battery life depends on the kind of device used, whether or not it is being used for other applications simultaneously, and how old the battery is in the device. In general, however, we feel it is relatively safe to say that most will work longer than the best dedicated monitor battery if the device is dedicated for use with the monitor only and is not running other applications simultaneously.
You'll get great video quality and an easy-to-setup system with the Safety 1st HD WiFi Baby Monitor. But the real reason to consider this device is a helpful portable audio unit you can carry with you that lets you hear what's going on in the nursery without having to notice and respond to push notifications on your phone. There's little delay when you use the two-way audio feature, and the portable unit will even flash when the camera detects motion for a helpful visual cue to launch the companion app.
As you'd expect, the talk-back functionality and audio quality on the VTech are great—easily better than the rudimentary talk-back features on our video monitor picks. With the battery lasting about 19 hours on a full charge, this monitor has the strongest battery life of any in our test. Rated to a range of 1,000 feet, it exceeds the range of our pick (700 feet) both as advertised and in practice during tests.
Microphone sensitivity: There’s a difference between hearing your baby cry, and hearing every little noise. All baby monitors have the option to turn down the volume, but some offer thresholds for parents who are more comfortable with only hearing the biggest upsets, and prefer not to hear the self-comforting noises their baby makes as they fall asleep.
Not everyone needs a baby monitor. If you live in a smaller house or apartment, keep your infant in close proximity, or just generally don’t feel the need to monitor your baby as they’re sleeping (the infant cry is hard to miss!), you may find that a monitor is unnecessary. Other people may only want a monitor for occasional use, like when you’re out in your yard while your baby is napping and want to know when they’ve woken up.
But these nursery essentials can be as fussy as the babies they keep tabs on. And like virtually every other household appliance, they are growing increasingly more capable and complex. In addition to conventional video baby monitors that use a camera and a handheld LCD display, often called a “parent unit,” there are now also Wi-Fi-enabled systems that connect to your home network and use your smartphone as both the display and the controller, much like DIY home security cameras. These latter models offer high-defition video, intelligent alerts, and the ability to check on your child from anywhere you have an internet connection.
The VTech DM221 audio monitor is the best choice in the category—it's consistently a best seller at multiple retailers, with thousands of positive customer reviews. Losing video is a major sacrifice, of course, but we could see this monitor being a good choice for parents of toddlers who are considering replacing a failing monitor, or people who want a monitor only so they can hear their kid crying out from a distant bedroom.