Build your wireless In-ear monitor systemThe U4 personal wireless monitoring system delivers great sounding audio to your favorite in-ear monitors.Enhance your stage performance with freedom from wires with U4’s easy to use and portable plug-and-play design. Built using the highest quality components housed in a durable metal chassis ensures reliable wireless performance at every show.ALL WIRELESSPLUG-AND-PLAYEasy to carry, easy to set up, plug in and turn on the power to build your wireless In-ear monitor system Input ModeLINE MODEUse with mixers or other professional audio devices that send line-level signals.AUX MODEUse when connecting consumer audio devices such as portable audio players or computers.LIVE PERFORMANCE MONITORTransmitter with the 1/4”ts conversion put in to the mixing Aux channel, set transmitter to aux mode. Or Transmitter put in the mixing XLR main output， for Band playing, silent rehearsal etc.. set transmitter to Line mode.MULTIPLE RECEIVERSUse one transmitter to send signal to Multiple Receivers- creates monitoring for the entire band. Send the signal from one transmitter to as many receivers as needed simultaneously, Simply set as many receivers as needed to the same channel as the transmitter. OR - In situations where multiple “mixes” are needed on stage, each unit has 6 select-able channels for creating up to 6 individual discrete mixes. If you use more than one transmitter, The receiver can switch between different sound sources by simply changing the channel selector.