Little Bear Mc5 Mini Portable Stereo 4 Channel Audio Mixer Passive Live Studio Fully upgrade!!! Specially designed an input impedance switch to switch between 1K(default) and 4.7K, can match with different audio source well. MC5 stereo audio mixer with 4 channel 3.5mm inputs and 1 channel 3.5mm output, which is capable of mixing the signals from CD players, instruments, portable recording devices, video playback devices and so on. Mini size with exquisite appearance, passive circuit design won?t boost or reduce the audio signal. And MC5 can work without battery or external power, very convenient to carry and use any time any where. With one main output volume knob and four independent input volume knob, 4 channels input have no interference to each other. Providing the highest sonic quality even at maximum output level.