The BEG PD3-2C-FC-MIC two-channel PIR and audio sensor is designed to switch both lights and exhaust fans in commercial and public toilet/washrooms.
Traditional PIR sensors cannot simultaneously look into washrooms cubicles, so this lack of detecting capability can be overcome by having an adjustable sound listening feature that hears you when out of sight of the sensor. The two-channel PD3 keeps both the lights and fan operating simultaneously while out of view.