Advanced Fingerprint Identification: Everyone has a unique fingerprint and no one can steal it. The smart lock adopts advanced fingerprint technology-scratchproof, dustproof and waterproof sensor to make unlocking easy and secure. 250 fingerprints can be enrolled. Identification time is less than 0.7 seconds. Anti-peep Password: "Anti-peep password" ensures that strangers cannot steal your password by watching you nearby when you enter the password. This function allows the user to type in any numbers before or after the correct password (As long as the correct password is embedded in the longer set of numbers) and can still gain access. Easy Access Opening Card: Comes with 3pcs inductive cards. Cellphone App Remote Unlock Function: Use App to send a disposable password to your guest, no longer restricted by distance. 4 ways to unlock: Fingerprint+Card+Password+Key; suit for 3.8-4cm thick wooden doors. Specification: Material: Metal Overall Size: Approx. 350x78mm/13.78x3.07 inches Lock Body Size: Approx. 24x240mm/0.94x9.45 inches Package Includes: 1 Set of Lock 3 Pieces Inductive Cards 2 Pieces Keys 1 Bag of Screws Accessories Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color of the pictures and the actual item.