Safe and reliable fingerprint unlocking in 0.3s and recognition rate up to 99%, 3 seconds automatically locked after unlocking, the stainless steel door lock is sturdy and tamper-proof. More multi-function keys for fingerprint unlocking, code unlocking, mechanical key unlocking, it can enter 50 fingerprints, exiting with keys or without keys are two completely different live. Easy to install, no wiring and no drilling. Quickly and easily install the lock with just a small screwdriver, adjustable latch. Both left and right doors are suitable. Fits most standard residential doors, or apartment, office, etc. Long battery life, low power consumption. It requires 4 AAA batteries which can work for more than a year. Low battery reminder. Emergency USB charging port and normal key unlocking method provide double guarantee