AROMA ARU-03S True Diversity UHF Wireless Audio Transmission System Transmitter Receiver Built-in Rechargeable Lithium Battery Max. 20M Transmission Range 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. Receiver adopts the true diversity receiving method to make the signal transmission more stable, and transmitter 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 e. 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). Specifications: System Frequency Response: 40Hz-18kHz Channel: 5 UHF Channels Frequency: 863.7MHz/ 866.7MHz/ 869.7MHz/ 872.7MHz/ 876.7MHz Transmission Range: Max.20M (No obstacle) Transmission Delay: Less Than 5ms Signal Noise Ratio: <-85dB Power Supply: Built-in 3.7V 380mAh rechargeable lithium battery Charge Port: Micro USB Receiver Size: 15 * 6 *2cm / 5.9 * 2.4 * 0.8in Receiver Weight: 115g / 4.1oz Transmitter Size: 12 * 2.5 * 2cm / 4.7 * 1 * 0.8in Transmitter Weight: 47g / 1.7oz Package Size: 19 * 17 * 3cm / 7.5 * 6.7 * 1.2in Package Weight: 230g / 8.1oz Note: The guitar showed in the picture are not included. Package List: 1 * Transmitter 1 * Receiver 1 * User Manual(English & Chinese) 1 * USB Charging Cable