This headset accessory require bodypack transmitter with Mini 4-pin connector. It is designed to be used with Shure Bodypack. The Bodypack Transmitter is not included with the purchase. This headset does compatible with Shure Body-Pack Transmitter Models: T1, ULX1, UR1, PG1, PGX1, PGXD1, SLX1, BLX1, BLXD1. (Not Compatible with Mipro, Peavey, Beyer ..