3-IN-1 FINGERPRINT DOOR KNOB - The ultimate security smart door lock for your smart home or office. The fingerpritn door knob meets all your needs of the convenience of a smart door knob, the security of App control, and the reliability of traditional keys. Great fingerprint door lock for bedroom, living room, apartment 3 MODES SMART DOOR KNOB - Easily switch modes by rotating your thumbprint around the smart door knob. The modes are passage mode, entrance mode, and privacy mode. Perfect bedroom door knobs with lock to keep unwanted guests from your privacy space. SECURITY BIOMETRIC DOOR LOCK -the fingerprint door lock can recognize your fingerprints, store 50 fingerprints, and 5s Auto locking feature to ensure your home security. Fingerprints are stored locally and not uploaded to the cloud to ensure your family's privacy. This smart door lock also features a visual power display and a low-battery alarm function. Please check the dimensions before purchasing the smart door l