On/Off Switch: Activate and deactivate the alarm at will, so you can still open your door or window without setting off an alarm. Simply turn back on when ready. Intruder/Burglar Alarm Secure your home with wireless intruder alarms. Pack of Four: One pack is enough to secure your main entrances and then some. Easy Installation: Attach one piece to your door or window, and the other piece to the door or window frame. Instant Alarm: As soon as the alarm is tripped, a 105 decibel alarm is triggered. Wireless Security Burglar Alarm | Living Social | Living Social