The functionality of the privacy pin technology is ingenious and very easy. To lock the door from the inside, press the small pin next to the door handle when the door is closed. To unlock the door, simply press the door handle down from the inside. If the outside door handle is operated while the door is locked from the inside, it simply runs into nothing. The lock unlocks silently and you can leave the room again. The KD Comfort lock is therefore ideally suited for all rooms in which privacy is important without having to spend a lot of time looking for a key.