3-in-1 Unlocking Methods: The smart doorknob offers three unlocking methods in one lock: fingerprint unlocking, app control, and emergency backup keys. It's a perfect fingerprint door security lock for keyless entry. Emergency Type-C Charging Port: Emergency power supply prevents the lock from being unlocked due to a power outage. The lock is equipped with an external Type-C emergency charging port that can be powered by a power bank or keys. Simple yet smarter and more secure: The smart lock adopts advanced technology, supports Tuya app control, allows fingerprint unlocking, and provides secure locking, helping you create a smarter and more convenient life and protect your family's safety. Classic yet stronger design: The doorknob expands upon the classic doorknob design, equipped with a fingerprint lock function and modern app control, making it an ideal smart lock for bedrooms, offices, apartments, and hotels. Easy installation: The fingerprint doorknob fits most doors with a thickness of 35-55mm and easily replaces existing door locks. The open mode is available at any time. In normal operation, the handle is set to open mode, so no additional setup is required. In open mode, the administrator can lock the door by pressing their fingerprint twice or by turning the knob.