16-channel portable ultra-compact UHF wireless headset system. Compact, lightweight headset transmitter fits snugly on back of head. No cord connection needed. Headset frame completely rubberized for comfortable, trouble-free performance. Flexible gooseneck allows optimum microphone positioning. 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. Unprecedented wireless portability with single AA battery-powered receiver. 1/4-inch plug for connecting receiver to powered speaker, mixer, or audio amplifier. Up to 250ft operating range line-of-sight. ASC™ (auto-sync channel) infrared wireless download pairs transmitter to selected receiver frequency for quick, easy setup. Transmitter powered by single AAA battery.