1、4.3in LCD Monitor: Including a 4.3 inch TFT LCD screen monitor, high definition photo quality, you can see the situation outside the door directly. 2、145° Wide Angle: The design of wide angle view gives a panoramic view of everything outside the door, eliminating all potential safety hazards. 3、Easy to Use: With an intelligent operating system, humanized design, simple and convenient for elderly and children to use, escorting your family's safety. 4、Long Standby: The doorbell has a built in 1800mAh li battery, which can last for long time after a full charge, with energy saving technology, automatic standby. 5、Simple Installation: Use the existing door viewer without destroying the door structure, no need to drill holes, no wiring, install and use directly. Item Type: Door Peephole Viewer Material: ABS LCD: 4.3in TFT Color Screen Viewing Angle: 145° Camera: 1MP Applicable Door Thickness Range: Approx. 35-110mm/1.38-4.33in Applicable Door Hole Range: Approx. 15-25mm/0.59-0.98in Power Supply: 1800mAh Li Battery x 1 (Built in) Indoor Unit Size: Approx. 130x85x13mm/5.12x3.35x0.51in 1 x Screen 1 x Door Viewer 6 x Screw 1 x Mounting Plate 1 x USB Cable 1 x Manual