16-channel portable UHF wireless instrument system for brass and woodwinds. Miniature, lightweight transmitter clips directly onto bell of horn. No cord connection needed. Protective rubberized clamp-on device easily locks transmitter firmly to horn. Flexible gooseneck allows optimum microphone positioning. Transmitter features high-performance microphone with tight cardioid polar pattern and wide frequency response to suppress unwanted feedback. Compact receiver can be placed anywhere you choose, powered by internal AA batteries or AC adapter (supplied). 16 user-selectable UHF frequencies for interference-free operation. ASC™ (auto-sync channel) infrared wireless download pairs transmitter to selected receiver frequency for quick, easy setup. Up to 250ft operating range line-of-sight. Transmitter powered by single AAA battery.