The in-home baby camera includes a temperature monitor, automatic night vision, and a sound-activated screen. At its core, a baby monitor serves one function: to let you remotely listen to—and in the case of modern models, see—your infant or toddler in another room, so you can ensure their comfort and safety. VTech seems intent on making sure parents are armed with an array of tools to do that, offering monitors that do everything from play lullabies to send video streams directly to your phone. The VM2251 is one of its latest, a camera that includes advanced features such as room-temperature monitoring and a sound-activated display. It's available in single- ($79.95) and two-camera ($99.95) packages.