2 Unlocking Ways: Buoan Smart Door Knob supports fingerprint unlocking and mechanical backup key unlocking. Provide a more convenient and secure way to enter your home! 0.3s Biometric Fingerprint Recognition: The biometric fingerprint door handle has an advanced 360°fingerprint sensor, 99% recognition rate, 0.3 reading fingerprint speed. It can store up to 50 fingerprint users, making it easier for your family and friends to use. Easy to Install: The fingerprint door knob can be easily installed with a screwdriver in minutes and fits most US door. And suitable for residence, front door, bedroom, apartment, office, garage, hotel, etc. Auto-Locking: This door handle locks automatically after you close the door for 5s. This can better ensure your safety, even if you forget to lock it sometimes. There are also silent and passage modes for your different life scenarios. Customer Service: Fingerprint door lock provides 30 days return policy, replacement within 12 months (if there is