1、ONE TOUCH UNLOCK: Fingerprint door handle is equipped with a pixel fingerprint sensor that recognizes your fingerprint in 0.25 seconds. You can add 30 fingerprints and the fingerprint recognition rate is up to 99 percent. 2、LONG LASTING TIME: Fingerprint lock requires 4xAAA batteries which can last up to 10‑12 months. There will be a low battery alert when the battery is dead and USB emergency charging is available. 3、TWO IN ONE DESIGN, ADJUSTABLE: Advanced 2 in 1 fingerprint lock, fingerprint unlock, spare key unlock. Adjustable door handle for left or right side, 2s auto lock and free pass mode. 4、FIT SIZE: The bedroom smart lock is designed to fit standard doors with 2‑3/8 inch (60 mm) and 2‑1/8 inch (70 mm) backplates and door thicknesses from 1‑3/8 inch to 2‑1/8 inch (35 mm‑55 mm). No wiring or drilling required. For both left and right doors. 5、FINGERPRINT DELETION: When wanting to delete a person's fingerprints, simply press and hold the setup button for 7 seconds and enter the fingerprints to be deleted without restoring factory settings! Administrator fingerprints cannot be deleted individually.