Never worry about forgetting your keys, losing them, or being locked out again. Unlock with your fingerprint, password, or mobile phone, making leaving the house effortless. Within minutes you can swap out your basic lock for the Smart Lock. The wire free technology makes installation quickly and easily, also security. If you forget to replace the battery and can't open the door, you can use USB backup power supply for emergency power supply to unlock the lock, or use a mechanical key to unlock the lock Advanced fingerprint recognition, non-contact IC card, password, mechanical key, with multiple door opening modes to choose from. The lock body size is 160*22mm (6.3*0.86in), suitable for door thickness 30mm-100mm (1.2in-3.9in).If you are replacing the lock on an old door, please measure the width and height of the guide plate and the thickness of the door Fingerprint Door Lock is powered by 4 AAA batteries (batteries not included),hold up to 50 fingerprints.The door lock module is waterproof, moisture-proof. It has been tested for high and low temperature, vibration, aging, etc. to adapt to harsh environments, Manufacturer: YBNKKUXKN