【LCD Screen】: The 2.8-inch 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 who's 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. 【Built-in Memory】: With built-in memory, photos are stored in a loop, eliminating the need for a memory card. 【Wide Angle】 Featuring a 90-degree wide-angle lens, you can see a broader view, ensuring you don't miss anyone. Features: Display: 2.8-inch LCD Screen LCD Resolution: 320*240p Camera Pixels: 0.3 MP IR Lights: 2 pcs, 850nm Memory: Built-in cyclic storage Power Supply: DC 1.5V AAA batteries * 4 (not included) Door Thickness: 35mm-120mm Size Mounting Hole Length: 14-22mm Color: Gold