3.5mm Stereo Audio Switcher: Bidirectional switching Splitter Audio Sharing active speakers and headphones Method 1: Connect 2 audios to (IN/OUT)1 and (IN/OUT)2, use the 1/2 switch to get an output; Method 2: Connect an audio to IN/OUT, select an audio output between (IN/OUT)1 and (IN/OUT)2; (The output can be switched between speakers and headphones) One-key mute, convenient and fast, very practical in special situations. Plug and play; No External Power Required;