Headset Microphone for Shure ULX SLX Wireless Beige Black is optional MiCWL B40
MICWL Pro Omnidirectional Wireless Condenser Headset Microphone. One Year Warranty Covered by MICWL Audio Inc. (Compatible Shure UR1 BLX SVX ULX SLX UR4D UR4S L1, 11, LX1, SC1, U1, UC1, UT1, T1, ULX1, UR1, PG1 and KCX. ).