Check the listing for details. Secustone Fingerprint Smart Lock Biometric Keyless Passcode Open Box. Color: Black, Condition: Open box. Listed at 35.00 USD. Open box, parts are sealed. Instructions included. Fingerprint door lock support three unlock modes: fingerprints, passcodes and mechanical keys, You can set according to your needs.You can even set the free pass mode and keep it unlocked at any time which is convenient for the children and the elderly to enter and exit freely. Keyless entry 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(Suitable for indoor and outdoor doors). Smart door lock requires 4 AAA batteries (not included), According to the frequency of use, it can be used for up to 8-10 months. It has low battery reminder function (the red light will flash three times when unlocking); Equipped with a USB interface for emergency charging.