The Alarm.com Wireless Video Doorbell (ADC-VDB780B) is a battery powered doorbell camera that features HD video, Video Analytics for rapid people detection, Two-Way Audio, a wide field of view, and a rechargeable battery. This completely wireless video doorbell gives you the flexibility to choose the perfect installation location without depending on the existing wiring or chime. The VDB780B must be connected over Wi-Fi to the Alarm.com Smart Chime (ADC-W115C).