Warm tip: the latest version, specially designed an input impendance switch to switch between 1K(default) and 4.7K, can match with different audio source well. Features 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 wont make interference to the sound quality. 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. Parameters Material: PCB+acrylic case Dimensions(L*W*H): 83.5*54*21mm / 3.29*2.13*0.83in (not included the knob) Net weight: 93g / 0.21lb Package weight: 132g / 0.29lb Packing List 1*MC5 Audio Mixer