Special Projects SP-2EVO-25 Wireless System With Dual Evo Waterproof Headworn Transmitters and Receiver No bodypack, no cables - just real, reliable wireless Waterproof microphone element and transmitter - you wont sweat this out Built-in recharging system - no more batteries to replace Frequency agile - 16 FCC-safe UHF channels - FCC frequency 540-570 MHz Noise-canceling microphone element