Features SMART DOOR VIEWER --- Smart visual door viewer kit, including 1MP peephole camera and monitor, can monitor the outside through the indoor unit. CAMERA SPECIFICATION --- The peephole camera adopts 1MP image sensor with a 90 degree super large viewing angle, increasing the visual range. MONITOR SPECIFICATION --- This monitor adopts a 2.8 inch color display screen with a resolution of 320x240, clear and intuitive, and easy to operate. APPLICABLE DOOR --- This peephole viewer is suitable for doors with a thickness of 40‑100mm and aperture of 14‑28mm, easy to install and use. BATTERY POWERED --- The electronic door viewer monitor is powered by battery (not included) to ensure long standby, and can be used at any time. Specification: Item Type: Visual Door Viewer Model: DD1S Display Screen: 2.8 Inch Color Display Screen Display Resolution: 320 x 240 Power Supply: 4 x AAA Battery (battery not included) Image Sensor: 1MP Camera Pixel: 1MP Support Door Thickness: Approx. 40-100mm / 1.6-3.9in Support Door Aperture: Approx. 14-28mm / 0.6-1.1in Large Viewing Angle: 90 Degree Package List:1 x Door Viewer1 x Monitor1 x User Manual4 x Screws Package List 1 x Door Viewer 1 x Monitor 1 x User Manual 4 x Screws