Easy installation and simple operation. Only need to lightly press to mute the device; very useful under special conditions. Plug and play; No power supply and other software required; 't affect sound quality. Super small size; Compact and super mini size; Easy to place and suitable for your desktop and office. This is a bidirectional switcher for 3.5mm audio ports. 3.5mm audio selector designed for customers having several audio sources and outputs. Main functions: Select audio input between 1 and 2 with 1/2 switcher and get one output; Select audio output between 1 and 2 to receive one input; How to use: connect two audio sources (like CD player / computer) to 1/2 ports audio output (like speakers) to IN/OUT port; connect one audio source to IN/OUT port and two audio outputs to 1/2 port. Colour:Black Material:Plastic Package Contents: 1 * Stereo Audio Switch 1 * 3.5mm Audio cable Only the above package content, other products are not included. Note: Light reflection 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.