Ardwolf A30 Keyless Smart Door Lock Keypad, with Reversible Lever and Automatic Locking Three ways to unlock: User codes(200), mifare cards(2 pack included) and the keys, user code is between 4-8 digits Automatic locking: For each valid entry, lock will automatically lock in 5 sec, if you do not want that, set the passage mode Reversible lever: fits both left-handed and right-handed doors. NOT WATERPROOF, only for home and office Interior doors Reset the lock: press and hold the reset button to set the lock back to manufacturer default status when the code and card doesnt work at all Fit doors: Single latch door, adjustable backset 2-3/8" or 2-3/4", door thickness between 1-3/8" (35mm) and 1-3/4"(45mm) The Ardwolf is committed to offer a more safety and convenient life style. The CJ8015 electronic lock may not that a good lock, but it does offer you a more safety and convenient entrance to your home and office. Three ways to unlock the door by user code, card and the key Passage mode will on after you set it and after the first valid entry, then the lock will stay in unlocked status Lockout mode will freeze the lock at its current status (Lock or unlock), temporarily disable all the user codes and user code. Re-enter the function code 99 to disable it Up to 200 user codes Up to 200 Mifare Cards Standard 12-key keypad Standard 12-key keypad Battery not included adjustable backset 2-3/8&#034; or 2-3/4&#034; door thickness between 1-3/8&#034; (35mm) and 1-3/4&#034;(45mm) Set the lock back to manufacturer default. Press and hold the reset button for about 10 seconds (3 beeps with LED blink red)