Stress free for large theater,installed sound and toursound applications WMS4500 is a reference multichannel wireless microphone system providing the highest channel quantity,maximum reliability and easy setup. The HC577 Set includes a rugged PT4500 body-pack transmitter with supreme audio quality. The package includes a HC577 premium skin colour head-worn microphone for on-stage use. Its patented body design protects the microphone from moisture and perspiration and the unique dual diaphragm capsule cancels out mechanical and cable noise.