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. It is easy to use, plug and play. 180 degree rotatable 1/4 inch plug, available for instruments with input in different positions. pecifications: Model: WS-20 Transmission Range: About 30M (No obstacle) Dynamic Range: 105db Power Supply: Built-in 3.7V 1100mA lithium battery Colour:Gold+black Material:ABS+Electronics Size:140 x 43mm Package Contents: 1 * Transmitter 1 * Receiver 1 * English Manual 1 * USB Charging Cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.