The Codelocks CL525 uses a combination outside and a lever inside. Easy code change. Can be used on rebated doors with corresponding rebate. Anti panic safety feature allows the outside lever handle to retract the latch after the correct code is entered. The spring loaded latchbolt will lock automatically when the door is closed. The key retracts the latchbolt for entry without the code. The key controls the deadbolt position. when the deadbolt is projected the safety feature allows the inside lever handle to retract the deadbolt and the latchbolt preventing people from being accidentally locked in. Code free allows for access without using the code making it perfect for use in high traffic areas during day time hours