WORK CHANNELS: UHF wireless ID pairing technology, support 4 variable channels. One end is connected to the instrument audio port, the other end is connected to the sound system. POWER SUPPLY: 3.7V/600mAH Built-in Li-battery and USB Cable. Equipped with USB charging cable, two Micro USB plugs, transmitter and receiver can be charged at the same time. APPLICATION: The guitar transmitter receiver are suitable for various occasions, class performance, the party, practice playing the electric guitar. PACKAGE LIST: 1 * transmitter, 1 * receiver, 1 * usb charging cable, 1 * manual. Note: Due to different production batches, the power switch has two modes (push up / push down to open). ASSURANCE: If you are not satisfied with our product you received, you can send emails to us at any time.We will reply you instantly and help you solve your problem.After-sales service 100% guarantee, if our products have quality problems after receiving the goods, you can choose free return or full refund. Features: There are four channels, up to four systems can be used simultaneously, the signals won't interfere with each other. Indicator light of transmitter: At boot, the indicator light will indicate the channel number according to the corresponding flashing times of channel. Later, the red light keeps on, with being in transmitting state. Indicator light of receiver: At boot, the indicator light will indicate the channel number according to the corresponding flashingtimes of channel. Specifications: Condition: Brand New Material: Plastic + Metal Color: Black Channel: 4 Frequency Response: UHF System Frequency Response: 20Hz~20KHz Frequency: 730 MHz Max. Transmission Distortion: