Audio Transmission System, for Dunamic/capacitive microphones, mixing consoles, instruments. Plug and play/Free conversion. 30-100 meters remote transmission distance, built-in dual antenna reception,stable transmission. Support multiple devices without interference. Multiple electroacoustic instruments achieve wireless audio transmission. Colour:black Material:ABS Due to different batches, there may be differences in product appearance and printed text, which will not affect use Package Contents: 2 x receiver 2 x transmitter 2 x USB cable 4 x adapter 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.