LCD Screen: With the 2.8 inch screen, you can easily see visitors' faces. It is safer and more convenient. Photo taking: When the visitor presses the doorbell, the host inside will ring the bell and the LCD screen will light up to take a photo . In on/off mode, you can also press the on/off button to take photos. Easy to register visitors. Power mode: powered by 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 loop without memory card needed. Wide angle With the 90 degree wide angle lens, you can see a bigger picture without missing friends. Features: Display: 2.8 inch LCD screen p> LCD Resolution: 320*240p Camera Pixels: 0.3 MP IR Lights: 2pcs, 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