Band limit:550.25-573.75MHz Receiving sensitivity:-88dB Channel:20CH Total harmonic distortion:0.2% Dynamic range:110dB output power:10mW Frequency response:20Hz-20KHz[3dB] transmission distance:30-50m Colour:Black Material:ABS Package Contents: 1 set * microphone o mixer (1 tray 1) 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.