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4 Port 3.5mm Stereo Audio Switcher: Bidirectional switching Splitter Audio Sharing active speakers and headphones 4 channel switch knobs, fully isolated circuit, make sure that each signal is not affected by the other three channels. 1: audios to (IN/OUT)/C/D, use the 4 channel switch knob to get an output; 2: Connect an audio to IN/OUT, select an audio output between (IN/OUT)/C/D; (The output can be switched between speakers and headphones) Plug and play; No External Power Required; 't affect the sound quality!