This is a convenient wireless system for instruments that use amplifiers, such as acoustic-electric guitars, electric guitars, and basses. It eliminates the need for cumbersome cables, allowing you to move freely and conveniently! You can play without stress on stage or even at home practice. It can be charged with the included micro USB cable. 【Product Specifications】 Audio Response Range: 20Hz～20kHz Frequency: UHF 730MHz Transmission Range: Up to 50M (without obstacles); 30M (through walls) Transmission Delay: Less than 4ms Power: Built-in lithium battery Charging Port: Micro USB