Cpolebev 4 Port Audio Switch, 3.5mm Audio Switcher, Stereo AUX Audio Selector, 4 Input 1Output/1Input 4 Output Audio Switcher Box

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