Safe and reliable fingerprint unlocking: 0.3 seconds unlocking time and up to 99% recognition rate. Automatic locking in 3 seconds after unlocking. Sturdy and tamper-proof stainless steel door lock. No more keys: Multi-function: unlock by fingerprint, code, or mechanical key. Support 50 fingerprints. Exit with or without key. Two completely different unlocking modes. Easy installation: No wiring or drilling. Quick and easy installation with a small screwdriver. Adjustable latch. Suitable for left and right doors. Compatible with most standard residential doors, apartments, offices, etc. Long-lasting battery. Low power consumption. Low battery reminder. Emergency USB charging port and standard key unlock provide double guarantees.