IRONZON Fingerprint Door Lock Smart Door Lock with App/Code/Backup Key/Fingerprint Smart Door Knob Keyless Entry Door Lock with Handle for Home Hotel Office Apartment Bedroom Blue, ??【4 Ways To Unlock】: Door Lock 4-in-1 with fingerprint + password + app + Key(2 include), fingerprint recognition rate up to 98% and open the door just need 1 second. You can add 50 groups fingerprints, Eliminate the trouble of forgetting to bring the key when you go out., ??【EASY INSTALLATION】: Fingerprint door lock is designed to fit US standard door, Backset 2-3/8″(60mm) and 2-1/8″(70mm), door thicknesses from 1-3/8'' to 2-1/8''(35mm -55mm). No wiring and no drilling. Fit both left handed and right handed doors., ??【UNLOCK WITH SAMRT APP】: You can use mobile phone to unlock, or you can set a temporary password and share it with friends, visitors or housekeepers. This door lock is very suitable for families, hotels, schools and garages. Support ios and android devices., ??【EMERGENCY CHARGING】: Keypad door knob requires 4 AAA batteries (included), it has low battery reminder function, equipped with a USB interface for emergency charging., ??【WARRANTY】：Fingerprint deadbolt lock provides with a one-year warranty from the date of purchase.When you encounter installation issues or there are missing parts, feel free to contact with customer service support., ,