DescriptionEasy installation and simple operation. High Quality 100% BRAND NEW! High quality rotary switch.Hot-swappable (no need to reboot computer). Compact and 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 transmission distance up to 8 meters, output transmission distance up to 8 meters.Super small size; Compact and super mini size; Easy to place and suitable for your desktop and office.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. Note:Only three-segment headphones are supported (four-segment headphones are not supported)Only one input can be played at a time.