When the door is closed, both the latch guard and the top and bottom swing bolts are activated. So you only need to close the door and your home is protected. The Biffar automatic lock gives you precisely this option. If you’re in a rush and don’t have time to turn the key four times, all you have to do is simply close the door and the Biffar automatic lock will take care of your safety all by itself. However, opening the door from the inside is as easy as ever – just turn the inside handle as usual and the door unlocks.