Usage Tips: 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 or additional software required; does not affect sound quality. Analog signal supports maximum 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. Main functions: Select audio input between (IN/OUT) A/D with 1/4 switch knob and get one output; select audio output between (IN/OUT) A/D to receive one input. How to use: Connect audio sources (such as CD player, computer, phone, MP3) to 1/4" ports and one audio output (such as speakers) to IN/OUT port; or connect one audio source to IN/OUT port and four audio outputs to 1/4" ports. Color: black. Material: aluminum alloy. Package contents: 1 x audio switcher splitter, 1 x audio cable. Only the above package content included; other products not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual item. Measurement allowance is +/- 1-3 cm.