1 3.5mm Audio Switch Switcher. 4(1)-in-1(4)-Out 3.5mm Stereo Audio Switch. ② connect 1 audio source to IN/OUT port and 4 audio outputs to 1/4 port. Input and output frequency range: 20Hz ~ 20KHz. 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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