Rowin WS-20 2.4G Wireless Rechargeable Electric Guitar Transmitter Receiver Set 30 Meters Transmission Range with USB Charging Cable Built-in a 1100mAh rechargeable battery long working hours and with USB port for charging. Audio & receiver set designed for electronic instruments like guitar bass etc. 2.4G uncompressed wireless transmitting ultra-short delay and transmission is about 30 meters. Supports 6 sets of devices working at same time one-to-one. 180° rotatable 1/4 plug available for instruments with input jack in different positions. It is easy to use plug and play. Note: musical instruments showed in pictures are not included. Specifications: Item Weight: 60g / 2.1oz for each Dynamic : 105db Model: WS-20 Color: Rose Gold/ Silver/ Black/ Silver+Black(optional) Item Size: 14 * 4.5 * 1.8cm / 5.5 * 1.8 * 0.7in Supply: Built-in 3.7V 1100mA battery Transmission : About 30M (No obstacle) Package List: 1 * 1 * USB Charging Cable 1 * Receiver 1 * User Manual