LCD screen: The 2.8-inch screen allows you to easily see visitors' faces. It is safer and more convenient. Taking photos: When the visitor presses the doorbell, the host will ring the bell inside and the LCD screen will light up to take a photo . In power mode, you can also press the power button to take photos. Easy to make visitor recordings. Power mode: runs on 4 AAA batteries (not included). Simply open the battery cover on the host side inside without having to remove the doorbell. The screen supports power indicator. Built-in memory: With built-in memory, photos are stored in a loop without the need for a memory card. Wide angle: The 90 degree wide angle lens, you can see a larger picture without missing friends. Display: 2.8 inch LCD screen Features: LCD Resolution: 320 * 240p Camera Pixels: 0.3 MP IR Lights: 2pcs, 850nm < p>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: silver