2-IN-1-OUT Mini 3.5mm Audio selector designed for customers having several audio sources and outputs 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 One key to Mute; very useful under special conditions Plug and Play; No power needed; Wont affect sound quality.Note: Only one audio is output at a time (you can switch between two audios) If there are any usage problems please contact the after-sales service directly, we will provide after-sales support for you.