Features ZINC ALLOY MATERIAL --- The door viewer adopts a zinc alloy peephole, which has high strength and good wear resistance to prevent prying and smashing open. WIRELESS CONNECTION --- The digital door viewer can be wirelessly connected with a WiFi router and can be monitored using smartphones or for Android tablets. INTERCOM FUNCTION --- Single or 1 way intercom with noise reduction function, supporting visitor viewing, video calls, snapshots, and recording functions. 3.5 INCH LCD SCREEN --- The electronic door bell viewer features a 3.5 inch LCD color screen, 120 degree wide angle field of view, and 1MP image sensor camera. APPLICABLE PLACES --- The door bell monitoring camera is widely used in homes, apartments, villas, hotels, or offices, making it easy to install and use. Specification: Item Type: Digital Door Viewer Field of View: 120 Degree Wide Angle Display Resolution: 480 x 320 Display Size: 3.5 Inch LCD Color Screen Image Sensor: 1MP Camera Resolution Doorway Diameter: Approx. 14-28mm / 0.55-1.1in Door Thickness: Approx. 40-100mm / 1.6-3.9in Indoor Equipment Diameter: Approx. 32mm / 1.3in Power Supply Mode: 4 x AAA Battery (battery not included) Package List:1 x Camera1 x Display Screen4 x Screws1 x User Manual Package List 1 x Camera 1 x Display Screen 4 x Screws 1 x User Manual