You're always home with Emerson's Smart Video Doorbell. With HD video, 2-way talk, motion activated alerts and night vision you'll never miss another visitor again. This device supports multiple users and includes an indoor chime as a convenient alternative when you don't want to use your phone. Comparable with IOS and Android. Requires 2.4GHz Wi-Fi. Dimensions (WxDxH) 2.3"x1.2"x5.6". Diagonal viewing angle: 120 degrees/ Horizontal viewing angle 100 degrees. Emerson Customer Support is available to help you with any issues at 1-800-898-9020.