1、Clear Display: 4.5in HD display and professional security camera, providing you with clear images and excellent visual experience. 2、Smart Camera: WiFi connection network, when someone rings the doorbell can dial the host mobile APP, the host can choose to connect the video or voice call. 3、Wide Angle: 160° wide angle and large field of view, effectively prevent thieves and protect your belongings security. 4、Motion Detection: With human infrared automatic photo and video recording function, high sensitivity, and can detect the movement of objects. 5、Night Vision: The doorbell system works stably, the night vision allows you to clearly observe visitors during the day and night. Item Type: WiFi Smart Digital Door Viewer Material: Zinc alloy Screen: 4.5in; 480 x 272 Camera Pixel: 1MP; 720P Camera Angle: 160° Power Supply: 4500mAh lithium battery x1 (built in); USB 5V chargingCloud Storage: 7 day information coverage TF Card: Maximum support 32G (without) Support Door Thickness: Approx: 35-120mm/1.37-4.72in Door Hole Range: Approx: 14-55mm/0.55-2.16in 1 x Screen 1 x Digital Door Viewer 1 x USB Cable 1 x Backboard 4 x Screw 1 x User Manual