Fingerprint Unlock: Identify your fingerprint within 0.3 seconds, unlock your door within 1 second. The biometric fingerprint recognition rate is 99.99%. [4 in 1] Unlock: 20 fingerprints+20 passwords+2 spare keys for family use+one-time password for temporary visitors, the one-time password will be automatically deleted after use. Security Locking: "Smart door locking" - The door lock auto-locked in 10-99 seconds; Press and hold any key for 2 seconds to "One touch Lock"; Rotatable knob- lock/unlock in 1 second from inside. Easy to Install: A screwdriver can complete the installation in a few minutes, suitable for all American standard left and right handed doors. ANSI Grade 3 standard certification, safe and durable