Douk Audio MC104-Pro Mini 4(1)-IN-1(4)-OUT 3.5mm Audio Switcher Passive Selector Headphone Splitter

Notice: except 4 IN/OUT 3.5mm jacks with black squares, there are another two IN/OUT 3.5mm jacks but cannot be used at the same time, that means when two audio device are connected, the lower jack is with priority. Features Using 4 independent switches to select different input or output, fully isolated independent circuit, maker sure that each signal is not affected by the other three channels. To solve the common ground noise caused by the connection of multiple audio sources. Preset 4 blank squares for you to write names of different audio equippments connected to MC104 PRO, more convenient for you to compare your lovely HiFi audio device and no need to check which machines are connected one by one. Two kinds of selection to satisfy different demands: 4-IN-1-OUT suitable for debugging equipment and do audio source contrast, 1-IN-4-OUT for headphone, power amplifier and active speakers contrast. Very easy to use and install, no power required and no additional software needed. Super mini size with compact exquisite appearance, can be carried in your pocket everywhere and decorate your desktop and office. Connection and Usage  1-IN-4-OUT 1 audio source =>4 active speakers / headphones => select among 4 outputs (Active speakers / headphones / Amplifiers)   4-IN-1-OUT 4 audio sources => 1 active speaker / headphone / Amplifier => select among 4 inputs (audio sources) Parameters Board: PCB, better shielding performance Keys and Knobs: 4 input/output selector button and 1 mute botton Dimensions (L * W * H): 84 * 55 * 25 mm / 33.1*21.7*9.8 in Net Weight: 73.5g / 0.16lb Packing List 1*Audio Switcher