The Smart Fingerprint Door Lock offers several ways to unlock, including through the APP, using mechanical keys, swiping a card, entering a password, and using your fingerprint. This door lock is made of durable and stylish aluminium alloy and is powered by dry batteries. It is suitable for various door types, such as steel, wooden, brass, and stainless steel doors, and offers connectivity through WIFI. It also has special features like a built-in gateway and support for gateway certification such as CE, FCC, and RoHS. The doorknob has biometric and key & keypad functions, with a powder-coated finish. It can be installed on doors with a thickness of 35-55mm and includes all necessary components. Please note that batteries are not included, so be sure to have 4pcs*1.5v AA batteries on hand. In case of emergency, you can still open the door with a USB or through the phone's NFC function. Delivery typically takes 5-10 days.