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 Camera 1 x Display Screen 4 x Screws 1 x User Manual Package List 1 x Camera 1 x Display Screen 4 x Screws 1 x User Manual