Built-in 1200 mAh lithium battery. Energy-saving design, low power consumption, long standby time. 120 degree wide angle lens. One million professional security high-definition cameras provide a clear insight into the details outside the door. High Definition Infrared Night Vision. Built-in 2pcs 940nm high brightness infrared night vision lamps. Zinc alloy outdoor extension. Zinc alloy is durable and better prevents external damage. Anti-destructive design to ensure home safety. Careless storage. With its own memory, no -in card is needed. Memory can store about 75 photos. (When the photos are full, the system deletes the oldest photos in chronological order, i.e. superposition and preservation. ) Suitable for all kinds of material anti-theft doors, composite doors, glass doors, steel doors. We solemnly promise you that if you find problems with the product itself, you can contact us in time. we will definitely give you a reply in the first place and return it for you. please feel free to use it., Manufacturer: Sonew