Good quality door/window safety alarm. Original product exclusively from thecitishop. Installation: can be easily mounted by strong self-adhesive tape on the back of the unit to door/window/cabin/drawers/cupboards etc. Fix the main unit beside the door/window and the magnetic stick to the door/window frame parallel to the main unit. No wiring required. Working: once mounted just turn the switch on. The alarm is activated when the two units are separated i.E when the door/window is opened. The 105 db continuous beep from the alarm will scare off any unwanted intruder and also draws attention from people around. Advantages: 1. Home security without the hassle of wiring. 2. Can be used to secure doors, windows, cabins, drawers, cupboards, safes, shutters etc. 3. Can also be used to draw parents' attention when kids open the doors of medical cabinet, kitchen lpg cabinet, basement doors etc.