2-channel Wireless Microphone System; VHF audio signal transmission design; Mixed 1/4 output connector; Dual telescoping receiver antennas; Independent channel rotary volume controls; On/off microphone broadcasting switch; AF/RF LED indicator lights ; Dynamic range: 80dB; Total harmonic distortion: .5%; Operation range: 164ft-492ft; Signal-to-noise ratio: 80dB; Battery-operated microphones require one 9V battery; Includes receiver base, 2 wireless microphones, 1/4 audio cable & wall power adapter;