Acoustic Glassbreak Sensors are routinely used to detect when a forceful intrusion into a home or office is attempted by someone breaking a glass barrier such as windows and doors. The device works by first listening for the sound of glass breaking and then detecting a change in air pressure within the room. This prevents false alarms when the kids inevitably drop a glass. The sensor should be mounted at least 3 ft. (1 m) and no more than 25 ft. away from windows that are being monitored. The Glassbreak Sensor should not be mounted in areas where a false detection may be occur, such as air vents, bathrooms, small utility rooms, kitchens, stairwells, residential garages, glass airlock entries and acoustically live rooms such as a home theater. These low voltage devices are simple to install and configure, and come in either a rectangle or round style.