Frequency: Some baby monitors operate on the same 2.4GHz frequency band as household products like microwaves, cordless phones, wireless speakers, and so on. When the monitor is on the same frequency as a number of other products, you can experience interference and static. You may want to get a monitor that uses a different frequency like 1.9GHz, which the Federal Communications Commission sets aside for audio-only applications. It's called DECT, or Digitally Enhanced Cordless Telecommunications.
During our tests, we found ourselves among the fraction of buyers having problems with the display on the DXR-8. Our first test unit worked fine out of the box, but after a couple of hours running on battery, the display became distorted and nothing would fix it. Likewise, you’ll find a few complaints on Amazon of users experiencing dead pixels after about a year of use (here’s one and here’s another). The good news: Those folks reported that Infant Optics replaced their monitors even though some were out of warranty. In fact, the company consistently receives decent feedback on customer service. Infant Optics quickly replaced our faulty unit (but as a media inquiry, that’s not comparable to typical customer service), and the new unit has performed fine.
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.
Gone are the days of silently peeking into the nursery to check on your napping baby and then, whoops, accidentally waking them up (“No, no, please no!”). A baby monitor uses a camera to watch over the crib, while you carry a handheld device that lets you know what’s going on with your child at any given moment, no matter where you are in your home. There are also other monitors that track sleep or breathing either with a clip or sock.