Which statement is true about acoustic glassbreak sensors?

Acoustic glassbreak sensors are designed to detect the sounds produced by breaking glass, and they can indeed classify these sounds based on frequency analysis. The statement regarding the two categories—single and dual frequency detection—accurately reflects the nature of how these sensors operate. Single frequency sensors typically respond to one frequency range, while dual frequency sensors can analyze two distinct frequency ranges, allowing for a more nuanced detection that can differentiate between a genuine glassbreak event and false alarms from other noises.

Understanding this functionality is crucial for proper security system design and implementation. By leveraging dual frequency detection, these sensors can be more reliable in varying environments that might produce background noise, thus improving overall security effectiveness. This capability is essential in preventing false positives and ensuring accurate recognition of actual threats.