【LCD Screen】: With the 2.8-inch screen, you can easily see visitors' faces. It is safer and more convenient. 【Photography】: When the visitor presses the doorbell, the host inside rings and the LCD screen lights up to take a photo. In on/off mode, you can also press the on/off button to take photos. Easy to record visitors. 【Power Supply Mode】: Powered by 4 AAA batteries (not included). Simply open the battery cover on the side of the host inside without having to remove the doorbell. The screen supports the power indicator. 【Built-in Memory】: With built-in memory, photos are stored in a loop without a memory card required. 【Wide Angle】 With a 90-degree wide-angle lens, you can see a larger picture without missing friends. Specifications: Display: 2.8 inch LCD screen LCD resolution: 320*240p Camera pixels: 0.3MP IR lamps: 2pcs, 850nm Memory: Built-in cyclic storage Power supply: DC 1.5V AAA batteries * 4 (not included) Door thickness: 35mm-120mm Mounting hole size: 14-22mm Color: Gold