Shure WA661 In-Line Bodypack Mute SwitchThe WA661 provides an easily accessible switch for muting lavalier and headset microphones that connect to wireless bodypack transmitters. Works with Axient Wireless Management Network, ULX D Digital Wireless, and UHF R Wireless. Features: For microphones with TA4F connectors Two position toggle switch with tactile feedback Robust metal belt clip No electrical switch noise >100 dB of attenuation for mute Passes bias voltage to power microphones