This keypad door knob (not deadbolt) works for exterior, interior, side, or garage entry bedroom doors. Fashion and smart functions promise a fresh new look for your home/offices.Keyless entry.The code lock provides 1 master code and 50 user codes.You're free to add, change, or delete user codes on the back-lit keypad.Enable silent mode if you don’t want to disturb.Password disguise can ensure upgrade security.Auto-locking in 5 seconds after you entry to make your life easy and comfortable.Simple two ways to access,passcode or key.Install this Keypad Door Lock by yourself.The keyless entry door knobs can stand wide temperature.Up to 50 user access codes and vistor mode is perfect for your office. Finish: satin nickel/matte black Package: 1* Keypad Door Knob lock 2* Keys (KW or YL) 1* User Manual 1* Screw Set 1* Strike Plastic Box 1* Strike Plate Product Details: Access: code or key Length of Passcode: 4-15 digits Power supply: 4 * AA batteries (Not included), USB type-c backup (Cable not included). Battery life : 2 Years or more Latch: Adjustable 60mm(2-3/8) or 70mm (2-3/4) Door thickness: 35mm to 65 mm(1-3/8 to 2-1/2) Environment: IP65 weather resistance /  -22F - +176F Function: Backlit Keypad/ Auto-lock / Visitor Mode/ Silent Mode/ Password Protect(anti peeping user code protection), etc.Warning: If you are installing the lock for the first time, when inserting the square tube into the latch, please do not forcibly twist the handle to insert the square tube into the latch, otherwise the door cannot be locked. The correct way is to make the square tube easy Insert the door latch horizontally (see video or installation manual).Key Way Tips:Twist the key until it cannot be turned, then the other hand twists the knob to help twist the key. so this makes it easy to open the door