Revolutionary Keypad Lock brings access and security to a new level. The Schlage Keypad Lock requires no keys and allows for up to 19 unique user codes. User codes are a simple 4 digit code much like a pin number for a debit card. The keypad has a special silicone layer to resist wear from use so that no one can figure out the code. Battery has a 3 year life and a built in 30 second delay when the battery life only has one month remaining. Of course if you ignore the smart alert from the battery - there is a manual key overide. No motors to fail, only the guaranteed Schlage quality that customers expect.