Instead, baby monitors offer more options for letting you know when something might be wrong at that moment. Temperature and humidity measurements are common among high-end monitors, along with alerts and notifications for when movement or a lack of movement is detected. The Baby Delight 5" Video, Movement and Positioning Monitor, for example, includes a pendant sensor that monitors your infant's movement and breathing patterns, letting you know if it gets too quiet or still.
From a pure imaging standpoint, night vision is vital for watching your baby sleep from another room, and is standard for most baby monitors. Motorized pan and tilt (which lets you swivel the camera from afar) isn't quite as common, but is very welcome if you have a toddler and want to scan an entire room. High-definition is a nice plus, but you don't need the highest-resolution sensor to keep tabs on your baby—most of the monitors we test use 720p cameras rather than 1080p.
Wireless encryption: This ensures that no one else can tap into your monitor’s “feed” and see what’s going on in your house. WiFi-enabled monitors are great for portability and range, but may be more susceptible to hacking. If you go this route, be sure to secure your home wireless network and keep the monitor’s firmware updated. Otherwise look for digital monitors with a 2.4 GHz FHSS wireless transmission.