Feature:1. Multiple Unlock Methods: You can not only unlock the door with your fingerprint, card, key or the you set, but also can open the door for APP, very smart and convenient.2. Secure Fingerprint Identification: Using semiconductor technology and biological characteristics, the same fingerprint is avoided, and security is guaranteed, and the fingerprint capacity is 40 pieces.3. Automatic 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.4. Long 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 .5. Easy Installation: Made of aluminum alloy material, durable and reliable quality. Comes with a bag of screws and a 50x50mm/1.97in lock body (22x160mm/0.79x6.3in) to hold doors 40‑60mm thick.How to Use:1. Open the package and check whether it is in good condition;2. Set according to the manual.Specification:Item Type: Smart Door LockPanel Material: Aluminum alloyColour: BlackBattery: AA x 4 (not included)Fingerprint Capacity: 40 piecesPassword Capacity: 40 groupsPassword Length: 6-8 digitsDoor Opening Direction: Left and right inside and outsideInstallation Door Thickness: Suitable for doors with a door thickness of 40-60mm/1.58-2.36in Package List:1 x Front Panel1 x Rear Panel1 x Lock Body1 x Plastic Case1 x Aluminum Shell2 x Card2 x Keys1 x Spring1 x Iron Block2 x Screw2 x Bolts4 x Small Screw1 x User Manual