The set of 6 mini alarms are a great way to protect your home, inexpensive and easy to install. Just install the batteries provided and using the sticky tabs stick on side to the dorr or window and the other side to the frame. We the dorr or window are opened this separated the two halves and a shrill alarm sounds.
Great to suppliment your alarm system if you isolate a room for a pet, and good for outhouses, sheds and medicine cabinets.