1:- Built-in 800 mAh lithium battery. Energy-saing design, low power consumption, long standby time. 90 degree wide angle lens. One million professional security high-definition cameras proide a clear insight into the details outside the door.1:- Built-in 800 mAh lithium battery. Energy-saing design, low power consumption, long standby time. 90 degree wide angle lens. One million professional security high-definition cameras proide a clear insight into the details outside the door.2:- High Definition Infrared Night ision. Built-in 2pcs 940nm high brightness infrared night ision lamps. Zinc alloy outdoor extension.3:- Zinc alloy is durable and better preents external damage. Anti-destructie design to ensure home safety. Careless storage. With its own memory, no plug-in card is needed.4:- Memory can store about 75 photos. (When the photos are full, the system deletes the oldest photos in chronological order, i.e. superposition and preseration. ) Suitable for all kinds of material