High quality rotary switch.Hot-swappable (no need to reboot computer).Super mini size:Easy to place and suitable for your desktop and office.Plug and play:No power supply and other software required; Won't affect sound quality.Analog signal maximum support 2V p-p input and output.Input and output frequency range: 20Hz ~ 20KHz.Use standard audio cable, input mission distance up to 8 meters, output mission distance up to 8 meters. Main functions: Select audio input between (IN/OUT)A/B/C/D with 1/4 switch knob and get one output; Select audio output between (IN/OUT)A/B/C/D to receive one input;How to use: connect 4 audio sources (like CD player / computer/Phone/MP3) to 1/4 ports and 1 audio output (like speakers) to IN/OUT port; connect 1 audio source to IN/OUT port and 4 audio outputs to 1/4 port.Colour:blackMaterial:Aluminum alloy Package Contents:1 x Audio Switcher Splitter1 x 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.