... ,Automatically 2.Suit for left/right,inward/outward door 3.20mm latch 4.1 year's guarantee 5 ... when it doesn't lock well (There have magnetic door detector between lock body and the lock keeper)4 ... alarm) 6.The delay locking time after unlock (door closed status5s,10s,30s are optional. The factory default ... is 5s 7.When the door closes,it locks immediately 8.Output of latch state ...