Built-in Memory: With built-in memory, it stores photos in a loop, no need for a memory card. Wide Viewing Angle: 90-degree wide-angle lens allows you to see a larger picture without missing any visiting friends. LCD Screen Display: The 2.8-inch display allows you to easily see the faces of visitors. It is safer and more practical. Power Supply Mode: Powered by 4 AAA batteries (not included), just open the battery cover on the side of the indoor host, no need to remove the doorbell. The screen supports power display. Photo Shooting: When the visitor presses the doorbell, the indoor host rings and the LCD screen turns on to take a photo. In power-on mode, you can press "power key" to takes photo too. Easy to make a visitor record., Manufacturer: QAXRZCUCD