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.
On many of our requirements, the Infant Optics DXR-8 delivers as well as the best monitors we tried: It has an adequate range for home use, acceptable image quality, an ability to add on multiple cameras, and overall simplicity and ease of use with a minimum of annoying quirks. It doesn’t offer the remote access or video storage options of our Wi-Fi–enabled pick, and its dedicated monitor may not seem as convenient as accessing a view via your smartphone—but the Infant Optics is easier to use where it matters most: You just pick it up, poke a button, and put it back down. Most of its specific flaws concern battery life and charging, but this is a common problem among baby monitors, and the company has a good record of responding to customer service issues.
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.