Shure WA360 In-line Mute Switch for LX1, PG1, PGX1, SC, SLX, T1, U1, UC1,ULX1 and UR1 Bodypack Transmitters In-line audio mute switch for Shure wireless body pack transmitters with a TA4F connector. Shure Model: WA360 UPC Code: 42406055154