The U4 is a digital wireless in-ear system that is cost-effective, reliable and very easy to use. The robust receiver is made entirely of metal with easy-to-reach volume control and the headphone amplifier is extremely powerful.
The transmitter and receiver are powered by built-in lithium batteries that can be easily charged with the included USB Y-cable, allowing you to charge both transmitter and receiver simultaneously with just one cable. No more hassle with changing batteries!
There are 6 selectable frequencies, which means you can have 6 different monitor mixes running simultaneously.
Multiple people can set their receivers to the same listening frequency. For example, if a four-member band can handle one monitor mix, you only need one transmitter and four receivers. If you want two different mixes, you need two transmitters and four receivers, and so on.