The RSB-2 toggle mute switch is the football standard for referee wireless systems. The RSB-2 plugs in between the lavalier or headworn microphone and the bodypack transmitter to provide a noiseless mute. The REV-WT and WTU-2 bodypacks automatically recognize the RSB-2 but older transmitters require a special referee version.
SWITCH BOX FOR TRANSMITTERS, The Bosch Group ADI, Telex
ELECTROVOICE/BOSCH-SECURITY-SY,Commercial Audio,Audio Signal Processing