VocoPro UDHPLAY8 EIGHT CHANNEL UHF Headset & Label Wireless Microphone Package with Mic-on-chip technology Includes 8 Body back Transmitters with 8 Headset mics and 8 Lapel mics. Operates in the 900 MHz Band, which is free of TV Station Interference All-in-one wireless Mic-On-IC has a pre-amp, compressor, and expander onboard VocoPro's UDH Hybrid wireless microphone systems are the reliable choice for multiple channel applications Plug and Play design requires no microphone syncing set-up