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.<br><br>Main functions: ① Select audio input between (IN/OUT)A/B/C/D with 1/4 switch knob and get one output; ② Select audio output between (IN/OUT)A/B/C/D to receive one input; How to use: ① connect 4 audio sources (like CD player / computer/Phone/MP3) to 1/4 ports and 1 audio output (like speakers) to IN/OUT port; ② connect 1 audio source to IN/OUT port and 4 audio outputs to 1/4 port. Colour:black Material:Aluminum alloy<br><br>Package Contents: 1 x Audio Switcher Splitter 1 x Audio Cable<br><br>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.