A8 1-Receiver 1-Transmitter / 1-Receiver 2-Transmitter Electric Guitar Receiver Transmitter, Wireless Guitar System, Instrument Receiver Transmitter, Audio Receiver Transmitter, UHF 2 Modes, Rechargeable Li-Ion Battery DC3.7V/300mAH, Long Lasting Battery Life, Lossless Long-Range Transmission, Plug And Play, Suitable For Wireless Instrument Sound Transmission And Reception, Guitar, Bass, Violin, Keyboard - Black