Lavalier System. Includes PGX1 Bodypack Transmitter, PGX4 Diversity Receiver, and WL185 Cardioid Instrument Microphone / 572-590mhz J6 Wireless Microphone systems serve one important purpose: to eliminate the cable which connects the micro phone (or musical instrument) to the Sound system. This gives the User greater freedom to move around, without being restrained by a cable. Shure's Lapel System using a WL-185 Cardioid Microphone. It's never been easier to go wireless - and sound like a pro. Shure's new PGX Performance Gear Wireless brings the superior sound of Shure Microphones together with innovative setup features in eight easy-to-use packages. Durably constructed, with 12 compatible systems (multiple bands) and included carrying case, PGX Performance Gear is the perfect system for performers on the go who want worry-free performance, every time.