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. 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. 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. Specifications: Model Number: DD1 Display: 2.8 inches LCD screen LCD Resolution: 320*240p Camera Pixels: 0.3MP IR Lights: 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: Silver, Gold (Optional) Host Size: 12.7*6.9*1.8cm/5*2.71*0.70in Host Weight (without batteries): 67g/2.34oz Peephole Size: phi;5.8*1.3cm/ phi;2.28*0.51in Peephole Weight: 27g/0.94oz Package Size: Approx.14.4*11.2*6.9cm/5.67*4.41*2.71in Package Weight: Approx. 235g/8.27oz Package List: 1*Indoor Host 1*Peephole Camera 1*Bag of Screws 1*Bracket 1*User Manual (English/Chinese)