About this item 【4 Ways To Unlock】: Door Lock 4-in-1 with fingerprint + app + e-Keys+ mechanical Key(2 include), fingerprint recognition rate up to 98% and open the door just in one second. You can add 50 groups fingerprints, Eliminate the trouble of forgetting to bring the key when you go out. 【Ease to Install】: 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, equipped with a small screwdriver. Fit both left handed and right handed doors. 【UNLOCK WITH SAMRT APP】: You can use mobile phone to unlock, or you can set a ekey and share it with friends, visitors or housekeepers for a temporary, fixed or even permanent time. 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, it has low battery reminder function, equipped with a USB interface for emergency charging. 【WARRANTY】： KPP fingerprint deadbolt lock provides with a 3-years warranty and lifetime technical support. When you encounter installation issues or there are missing parts, feel free to contact with customer service support.