16-channel portable UHF wireless plug-in system for microphone. Miniature, lightweight plug-in transmitter easily converts wired dynamic microphones to wireless. Connects to any vocal/instrument dynamic microphone with XLR jack. Compact receiver can be placed anywhere you choose, powered by internal AA batteries or AC adapter (supplied). 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.