This is the source gear for playing instrument without any cables. TR-U2 wireless system gives you the studio sound quality. The Yuer TR-U2 6-channel wireless guitar systems offers a low-cost, plug-and-play way to discover the far corners of the stage without being tied to a jack lead. Fully charged, the in-built rechargeable lithium battery allows you to play freely for up to 8 hours using a maximum of four TR-U2 systems at the same time. Supports electric guitar, bass, acoustic guitar and so on.