This audio mixer is professional and compatible with any of your devices. It helps with reverb qualities, has an ARM chip. Audio mixer with delay, pitch changing. Works with low noise. Micx4, 2RCA, PC, 2LINE, USB, BT, 3.5MINIPH OUT:1, 3.5MINI LOOPBACK OUTPUT. LED turns on when the signal after EQ reaches 3dB below distortion. Switchable EFX/G1, G2 signals will receive before or after the channel volume control Level indicates the MAIN STEREO LEVEL knob, the green light will be on. When the signal after MAIN Level reaches 0dB, the red light will be clipped. When the signal reaches 0dB below the distortion, the LED will turn on and light up. Input and output level : MIC (-60dB) LINE ONPUT (-40dB)