Keyless entry for enhanced security, no keys to lose or forget * Turn knob allows you to feel the deadbolt lock when you turn it * Keypad illuminates so you can see it at night * Codes easily added or deleted right at the keypad using the lock"s unique 6 digit programming code * Includes 9-volt battery, a 6 digit programming code, and two 4 digit user codes pre-set at the factory