Features: 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 US 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. specification:Item Type: Fingerprint Lock Material: Zinc Alloy Size: Length: Approx. 145mm/5.71in Left Side Width: Approx. 65mm/2.56in Right Side Width: Approx. 28mm/1.10in Fingerprint Type: Semiconductor Unlocking Method: Fingerprint, Mechanical Key Fingerprint Capacity: 30 Groups Recognition Speed: 0.25s Emergency Power Supply: USB Battery Type: 4 x AAA Alkaline Batteries (Not Included) PackageList: 1 Set x Smart Lock Assembly (2 Pieces) 1 Set x Lock Cylinder Assembly (15 Pieces) 1 x Screwdriver 2 x Mechanical Key 1 x Instruction Manual NoteManual measurement please allow some error.