MX3 is a mini audio mixer with 2 groups of 3.5mm inputs, 1 group 3.5mm AUX output and 3.5mm headphone jack output, which is capable of mixing the signals from CD players, instruments, portable recording devices, video playback devices and so on. MX3 supports two working modes to satisfy different requirements: 1. Active mode: need to connect independent USB power, built-in audio amp chip will work, amplify the mixed audio signal and output larger power, can connect headphones to monitor music directly via the 3.5mm headphone jack. 2. Passive mode: no power required, MX3 will work in the state of pure resistance attenuation, output audio signal will be a little attenuated. And the headphone jack output will not support headphone monitoring directly but need to add a headphone amp. With one main output volume knob and two independent input volume knob, the input level of 2 groups can be controlled separately, have no interference to each other. Providing the highest sonic quality even at maximum output level. Mini size with exquisite appearance, flexible circuit both provides monitoring and mixing functions, and won?t make interference to the sound quality, compact design is very convenient to carry and use any time any where.