LCD Screen: The 2.8inch screen allows you to easily see visitors faces, offering enhanced security and convenience. Photography: When a visitor presses the doorbell, the indoor unit rings and the LCD screen illuminates to take a photo, capturing a record of their visit. In on/off mode, you can also press the power button to take photos. Easily keep track of whos at your door. Power Mode: Powered by 4 AAA batteries (not included). Simply open the battery cover on the indoor unit without removing the doorbell. The screen supports a power indicator. Builtin Memory: With builtin memory, photos are stored in a loop, eliminating the need for a memory card. Wide Angle Featuring a 90degree wideangle lens, you can see a broader view, ensuring you dont miss anyone. Features: Display: 2.8inch LCD Screen LCD Resolution: 320*240p Camera Pixels: 0.3 MP IR Lights: 2 pcs, 850nm Memory: Builtin cyclic storage Power Supply: DC 1.5V AAA batteries * 4 (not included) Door Thickness: 35mm120mm Size Mounting Hole Length: 1422mm Color: Gold