[Replaceable Batteries & Emergency Power]This fingerprint door lock uses 4 AAA batteries (batteries are not included), with a battery life of up to 8-10 months. The low battery alert feature ensures you're warned in advance to avoid accidental unlocking. The fingerprint door knob also supports Type-C emergency power(non-rechargeable) [Doorbell Function Available]Our smart door locks include a doorbell button, a combination of tradition and technology that ensures you are alerted when your guests are visiting without disturbing your neighbors. [Fingerprint Unlock]advanced fingerprint recognition technology. This smart fingerprint lock can store up to 100 fingerprints,Fingerprint door lock features a fast response time and automatically locks within 3 seconds after closing the door for security. All fingerprint data is stored locally on the device, ensuring your personal information safe [5-in-1 Smart Door Lock]Our smart door handle offers 4 unlocking methods, including fingerprint recognition, password entry(temporary password included), IC card access(2PCS) and key(2PCS)and Tuya app. This smart door knob is perfect for bedroom, living room, , , flat, rental house. Quadruple security layers adapt to your lifestyle. [Easy Installation]Our fingerprint door locks are easy to install and fit most doors., Weight: 1.53551965483 Pounds, Manufacturer: NONDK