Kwikset 99170-003 SmartCode 917 Keypad Keyless Entry Contemporary Residential Electronic Lever Lock Deadbolt Alternative with Halifax Door Handle and SmartKey Security, Satin Nickel, Keyless entry convenience: The SmartCode 917 keyless entry electronic lever allows you to program up to 30 user access codes that can be customized for family, friends, or guests, including optional one-time user codes, Reversible door handing: Halifax door lever is reversible and can easily be installed on left-hand or right-hand doors, Switch between three entry modes: Multiple locking settings include ""Auto Lock"" (locks after every entry and exit), ""Passage"" (stays unlocked and no key or code required), and ""Disable Passage"" (for property managers, auto-locks every time and a key or code is always required for entry), SmartKey Security protects against advanced break-in techniques and allows you to re-key the lock yourself in seconds, Up to 3 year battery life and runs on a 9V battery; 9V battery included in box, ,