The SafeLogic BackLit electronic lock is a very reliable and robust lock system. It features SecuRam's rugged stainless steel construction and backlighting keypad making access easy in dimly lit areas. For reliability and quality control, every SecuRam lock undergoes a 2,000 cycle quality management program before it leaves the manufacturing facility. Product Features 1 User Code EntryPad is BackLit. Press any button and the Backlighting activates. 9 Volt Battery powers the system 10,000+ openings on a 9 Volt battery Motor Driven lock Automatic relock 5 minute Penalty LockOut upon entry of 4 incorrect codes