Wireless transmitters and receivers are available for electroacoustic instruments such as guitars, basses, violins, and more. Ultra-high frequency 730mhz sound transmission, anti-interference, ultra-short delay. Support 4 groups of devices to use at the same time, the maximum transmission range can reach 30 meters. Built-in rechargeable lithium battery, long working time, equipped with USB cable, easy to charge. Plug and play, easy to use, small size, light weight, easy to carry Product Name:Wireless Audio System Product interface: -USB Frequency range:UHF Frequency broadband:20HZ-20KHZ Transmission delay: 4 ms Colour:Black Material:pvc Size:11x4.3x1.7cm Package Contents: 2 * Guitar Wireless Transmitter 2 * Guitar Receiver 2 * USB cable 2 * Chinese and English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.