Description: Wireless connection: This door bell supports 2.4G WiFi, so the door bell and the receiver won't need to connect via a cable. HD: This electric doorbell features 720P resolution and makes you can see the view more clearly, and features night view function. Intercom: This wireless door bell supports two way communication, making you can easily communicate with the visitors. Long use time: This wireless doorbell is designed with an 800mAh large capacity battery, so the door ring can work longer. Suitable places: This electric door bell is a good fit for home, office, hotel, apartment, and many other locations. Specification: Color: Black. Battery: 800mAh(Built-in). Resolution: 720P. Door bell size: Approx. 42x25x81mm/1.65x0.98x3.19 inch. Receiver size: Approx. 40x39x64mm/1.57x1.54x2.52 inch. Note: There might be a bit of color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Package Includes: 1 Piece Door Bell(with 1 Piece Receiver, 1 Piece User Manual, 1 Piece Sticker, 1 Piece Screw). Wireless connection: This door bell supports 2.4G WiFi, so the door bell and the receiver won't need to connect via a cable HD: This electric doorbell features 720P resolution and makes you can see the view more clearly, and features night view function Intercom: This wireless door bell supports two way communication, making you can easily communicate with the visitors Long use time: This wireless doorbell is designed with an 800mAh large capacity battery, so the door ring can work longer Suitable places: This electric door bell is a good fit for home, office, hotel, apartment, and many other locations