4 Port 3.5mm Stereo Audio Switcher: Bidirectional switching Splitter Audio Sharing active speakers and headphones 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)4 channel switch knobs, fully isolated circuit, make that each signal is not affected by the other three channels.Plug and play; No External 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 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.