ANS501 Ambient Noise Sensor from Bogen consists of a control module, a microphone module and a 12V/0.4A wall-mounted power supply. The system is designed to electronically adjust the level of a page announcement in an area where ambient noise levels are continuously changing. Up to four microphone modules can be wired in parallel to monitor larger locations. ANS501 Ambient Noise Sensor includes controls for maximum boost, activity threshold, relative gain, AUX input level, ramp speed and ambient MIC input threshold. All wiring connections to the control module are made via pluggable screw terminals or RCA jacks.