Easy installation and simple operation. High quality switch.Hot-swappable (no need to reboot computer). Plug and play; No supply and other software required; 't affect sound quality.Analog signal maximum support 2V p-p input and output. Input and output frequency range: 20Hz - 20KHz. standard audio cable, input transmission distance up to 8 , output transmission distance up to 8 .Super small size; Compact and super mini size; Easy to place and suitable for your desktop and office.4 Port 3.5mm Audio Bi-Directional SwitcherThis is a 4 Port bidirectional switcher for 3.5mm audio ports.3.5mm audio selector designed for customers having audio sources and outputs.One more function outputMain functions: Select audio input between (IN/OUT)/C/D with 1/4 switch knob and get one output; Select audio output between (IN/OUT)/C/D to receive one input;How to : 4 audio sources (like CD player / computer/Phone/MP3) to 1/4 ports and 1 audio output (like speakers) to IN/OUT port; 1 audio source to IN/OUT port and 4 audio outputs to 1/4 port.Type:Audio Switchcolour:BlackMaterial:plasticPackage Contents:1 x 3.5mm Audio Switch Switcher1 x 3.5mm Audio cableOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.