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