Fast & easy setup Simply press the channel button on the front of receiver & choose one of 10 available channels. A seven-segment LED indicates instantly if the selected channel is available. Once this is done, choose the same on the transmitter, & you are ready to go. How many musicians can use this system simultaneously? A maximum of four musicians can use Performance Gear Wireless systems in parallel. One wireless system consists of one bodypack transmitter & one receiver, so at a maximum you can run two dual receiver systems simultaneously. Internal antennas For ideal signal strength, antennas on a wireless system need to be setup in a certain way. The internal antennas on Performance Gear Wireless systems are already set in this ideal way, offering up to 75 m operating range & optimal signal strength. in addition internal antennas cannot be broken during setup, use or transport. Hassle free setup Internal antennas simplify operation & storage Only one channel select button A seven-segment LED indicated instantly if the selected channel is occupied Reliable wireless technology Microprocessor controlled Predictive Diversity 10 selectable frequencies Upto 4 compatible systems per band Shure standard ruggedness 80 years of microphone expertise