Smart Lock Kit GHRT-34

Small but effective - this is probably the best way to describe the door and window contact. Because who doesn't know it: You have left your home and are suddenly no longer sure whether all windows and doors are closed. With door and window contact, this problem is a thing of the past. When leaving the house, the contact detects whether a door is still open or a window has been left open and reports this immediately to the Smart Home System and thus also to your smartphone.