1Multiple Unlock Methods: You can not only unlock the door with your fingerprint, card, key or the code you set, but also can open the door for tuya APP, very smart and convenient. 2Secure Fingerprint Identification: Using semiconductor technology and biological characteristics, the same fingerprint is avoided, and security is guaranteed, and the fingerprint capacity is 40 pieces. 3Automatic Lock: Ergonomically designed, it can be easily unlocked by fingerprint within 1 second. It automatically locks for you, keeping you and your family safe at all times. 4Long Service Life: No more worry about pollution or wasting money. Powered by 4 AA batteries(NOT INCLUDED), it can be used for half of a year . 5Easy Installation: Made of aluminum alloy material, durable and reliable quality. Comes with a bag of screws and a 50x50mm/97in lock body (22x160mm/0.79x6.3in) to hold doors 4060mm thick.