4 Port 3.5mm Stereo Audio Switcher: Bidirectional switching Splitter Audio Sharing active speakers and headphonesMethod 1: Connect 4 audios to (IN/OUT)A/B/C/D, use the 4 channel switch knob to get an output;Method 2: Connect an audio to IN/OUT, select an audio output between (IN/OUT)A/B/C/D; (The output can be switched between speakers and headphones)4 channel switch knobs, fully isolated independent circuit, make sure that each signal is not affected by the other three channels.Plug and play; No External Power Required; Won't affect the sound quality!colour:BlackMaterial:Plasticsize:7.8 x 4.8cmPackage Contents:1 x 3.5mm Audio Switch Switcher1 x 3.5mm Audio cableOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.