Pacsafe prosafe 750 tsa accepted key card lock 2 pack black description the prosafe 750 uses a coded key card locking mechanism to unlock itthe advantages are that you dont have to keep extra keys with you and you dont have to remember any code to unlock your lock you just need to insert either of the punched corners of the card into the lock slot from the top of the slot in a 90 degree position press firmly until lock snaps opento lock it simply press the shackle closed rem