The door and window entry alarm twin pack is designed to provide low cost and effective protection. The door and window entry alarm is ideal for condos, apartments, student dorms, homes and offices. The alarms are easily mounted by using the adhesive tape and adhere to the door or window. To test the alarm, switch to "on" position and open the door or window. Close the door or window with the device in the "on" position and you are ready to go.