Small size but lossless professional sound quality, low noise, low latency, good resolution. 2.4GHz wireless transmission frequency band, 24 bit/48KHz sampling rate. 30 meters long effective transmission distance. One-button switch mono/stereo to meet the needs of your different devices. Built-in rechargeable lithium-ion battery, which can be easily via USB. Can support 5 sets of devices working at the same time. The transmitter can be used as a clip-on wireless microphone or as a pocket transmitter. Colour:Black Material:ABS Package Contents: 1 * ear monitor transmitter 1 * ear monitor receiver 1 * data cable 2 * 3.5 audio cable 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.