Item Type: Video Doorbell Material: ABS Model: DD3 Color: Black Charging: USB Charging Built-In Battery: Button Cell Battery 600mAh Display: 2.4inch LCD Screen Camera Pixels: 0.3MP Resolution: 320 x 240 Infrared Lights: 2Pcs, 850nm Memory: Built-In Cyclic Storage Weight: Approx. 212g / 7.5oz Indoor Part Size: Approx. 80x80x16mm / 3.1x3.1x0.6in Outdoor Part Size: Approx. 58x13mm / 2.3x0.5in Door Thickness: 35-120mm/1.38-4.72in Mounting Hole Size: 14-28mm/0.55-1.1in Installation: 1. Remove the existing peephole and install an external camera 2. Install the peephole wire part 3. Connect the screws of the correct size from the screw kit, and then connect the internal plug-in power cable to the monitor Package List 1 x Indoor Unit 1 x Outdoor Unit 1 x USB Charging Cable 1 x Manual 3 x Screw 1 x Metal Bracket 1. Please allow 01 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 1With a 2.4inch LCD screen, you can easily see the visitors face, which is safe and practical. 290degree wideangle lens design allows you to see larger images without missing any visiting friends. 3Builtin memory function, can store photos in a loop without the need for a memory card. 4With infrared night viewing function, visitors can be clearly seen even in the dark night. 5When visitor presses doorbell, the indoor host will ring, LCD screen will turn on to take pictures, and in poweron mode, press power button to take pictures. 6Support photo browsing, boot status setting, visitor record deletion, suitable for home, office, etc.