We supply problem children who unfortunately ran everywhere go in the morning at 3:00 sneak through the house and looking for candy or make the purses of other family members! Include the children was not an option, completing every door in the house, where there would be something to mopsen was disturbing and partially unfeasible. Now we have this small and inconspicuous "alarms" attached to the doors and the small thieves have no chance! The children from the room if necessary and we can check what's going on. In the morning the alarm is turned on / off by pushing button and we can once again sleep soundly at night. The kids also, incidentally: Since we installed the parts, night rest and no one goes more wandering :-) The pretty loud alarm sound is deterrent enough! For the price a bargain! Alarm is loud and annoying enough and attaching mittles tape works well. Even with our slightly tilted and old doors, which close is not always uniform, the alarm window could be easily and fully glued functional after recently Try the magnetic barrier. For our purposes, the best and cheapest alternative.