MICROPHONE-TRANSMITTER FEATURES 1. Grille: Protects the microphone cartridge and helps reduce breath sounds and wind noise. The grilles for the various microphone heads differ in appearance. 2. Power and Audio Mute Switch : put the switch to ON potion, the Indicator shines fora moment. Put the switch to "MUTE", Allows muting of the microphone validity, avoiding the "thump" noise that can occur when muting of the microphone audio. tt is recessed to prevent it from being accidentally muted off. 3.