1 4 Port3.5mm Audio Switch Switcher. ② connect 1 audio source to IN/OUT port and 4 audio outputs to 1/4 port. ① Select audio input between (IN/OUT)A/B/C/D with 1/4 switch knob and get one output;. ① connect 4 audio sources (like CD player / computer/Phone/MP3) to 1/4 ports and 1 audio output (like speakers) to IN/OUT port;.
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