Features: Dual systems and circuits design. The lock will alarm and change to standby circuit, when the main circuit is with low power. When the standby circuit is with low power, it lock will alarm. Dual motors design. You can start the standby motor to open the lock, when the main motor is broken down. Easy installation on all kind of doors, very convenient. No lock hole design, it completely abandons the traditional key and lock, in the fully opened and closed by remote controllers, realized the real security. Indoor touch Design, you can open/close the lock by touch the lock body when indoor. It is very convenient. Tiger lock method, more safe and stable. No keyholes outside, there is no way for thieves. Automatically lock function. If you dont need this function, you can close it by yourself. Add type-C external power source function. Make sure the lock works when battery was dead. (battery not included). Specifications: Brand: WAFU Product Name: Smart Lock Color: Black Material: Zinc Alloy+ABS Size: 165*87*36mm Frequency: 433MHz(500KHz) Power Supply: 4 AA Batteries/AC(not Included) Batteries Life: About 12 Months Unlock Methods: Remote Controllers Operation Range: Within 20m (no Obstacles) Transmission Method: RF Optional Function: tuya app, Fingerprint/Password/ Remote Key Color: Black Size: 60*30*10mm Weight: 25g Function: Unlock/Lock, Started Button(Start the Standby Motor) Power Supply: CR2032(3V) Battery Life: About 6 Months Standard Number: 2pcs (Included) Max. Keys Number: 10pcs(not Included) Package Size: Approx. 22.2*19.2*5.6cm Package Weight: Approx.1100g Package List: 1* Lock 1* Lock Body Holder 1* Lock Catch 2* Remote Keys 1* Bag of Mounting Screws 1* User Manual(English)