Features: Wireless audio transmission system powered by built-in rechargeable lithium batteries, are suitable for guitar, bass and other instruments with 6.35mm audio output jack.Transmitter and receiver with 6.35mm mono audio plug, 60° rotatable, compatible for different audio jack position.Transmitter and receiver are matched automatically when power on, one button for all control, easy and convenient to use.UHF frequency and FM high fidelity coding technology, delay time less than 5ms, without compression or distortion, and max. 20M transmission range.5 built-in UHF channels indicated by different color LED light: 863.7MHz-- red, 866.7MHz-- green, 869.7MHz-- blue, 872.7MHz-- yellow(red + green), 876.7MHz-- purple(red + blue). Description: Name: ARU-03 Transmitterweight:50gDimension: 120x22x24mm(excluding plug or antenna)ARU-03 Receiverweight: 48.5gDimension: 120x22x24mm(excluding plug or antenna)Whole package weight: 130gDimension: 112x30x145mmCharging time: about 3 hoursUsing time: 4-5 hours Specifications: System Frequency Response: 40Hz-18kHzChannel: 5 UHF ChannelsFrequency: 863.7MHz/ 866.7MHz/ 869.7MHz/ 872.7MHz/ 876.7MHzTransmission Range: Max.20M (No obstacle)Transmission Delay: Less Than 5msSignal Noise Ratio: <-85dBPower Supply: Built-in 3.7V 380mAh rechargeable lithium batteryCharge Port: Micro USBCharging time: about 3 hoursUsing time: 4-5 hours Note: The guitar and guitar amplifier showed in the picture are not included. Package Included: 1 * Transmitter1 * Receiver1 * USB Charging Cable1 * User Manual