Select audio input between 1 and 2 with 1/2 switcher and get one output;. 1 L / R Stereo Audio Bi-Directional Switcher. Connect one audio source to IN/OUT port and two audio outputs to 1/2 port;. Connect two audio sources (like CD player / computer) to 1/2 ports and one audio output (like speakers) to IN/OUT port;.
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