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. Unlike other digital locks, we provide 2 mechanical keys as a permanent fail-safe backup. Hidden keyhole design ensures security while giving you 100% peace of mind against battery failure. Fingerprint Door Lock is 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 Powered by 4x AA Alkaline batteries (not included), lasting up to 10-12 months (depending on usage). Features a Low Battery Alarm on the app and lock. In an emergency, use the USB-C Port on the outer handle to power the lock with a power bank, or simply use the mechanical key Easy DIY installation with just a screwdriver—refer to the included manual for the drilling template (if needed) and step-by-step guide., Manufacturer: YBNKKUXKN