The ShatterPro Acoustic Glassbreak Sensors are the latest breakthrough in Interlogix's advanced series of acoustic glassbreak sensors. In independent lab tests, they provide 25% better false alarm immunity than industry leading glassbreak sensors. The coverage pattern can be easily adjusted to fit small or large rooms. Interference outside the range will not cause false alarms. - 25 Percent Better False Alarm Immunity than Industry Leaders; - Adjustable to Room Size; - All New, Easy-access Design; - End-user Can Test Sensor Operation w/a Clap of the Hands; - Alarm Memory.