Wireless mitters and receivers are available for electroacoustic inst ents such as guitars, basses, violins, and more.Ultra-high frequency 730mhz sound mission, anti-interference, ultra-short delay.Support 4 groups of devices to use at the same time, the maximum mission 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 SystemProduct interface: Mucro-USBFrequency range:UHFFrequency broadband:20HZ-20KHZ mission delay:Greater than 4 msColour:BlackMaterial:pvcSize:11x4.3x1.7cm Package Contents:1 * Guitar Wireless mitter1 * Guitar Receiver 1 * USB cable1 * 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.