The PPS 35 Priority Page Sensor works with Extron Classroom AV Systems to automatically mute classroom audio during an announcement from a public address system. The sensor mounts to the face of any PA speaker and detects when audio is present, signaling the switcher to mute classroom audio for the duration of the announcement. The PPS 35 is compatible with the PVS 407D and PVS 405D switchers, as well as the PVCA 452 Controller Amplifier.