Usage Tips:4 Ways R L Stereo Audio Switcher - Bi-Directional switching splitter audio sharing active speakers,audio selector switch providing clear and distinct audio. Switch Knob - 4 channels switch knob,easily switch between audio in or out, fully isolated circuits, ensuring that each signal is not affected by the other three channels. Plug and Play - 4 Ports R L stereo audio switcher is no external power supply required, sound quality not be affected! Compact Design - 4 Ways Audio Switcher Splitter is 11cmx9.5cmx4.5cm/4.33inchx3.74inchx1.77inch,iron metal case, compact size and design, suitable for home and office use. Wide Compatible - L R Sound Channel Audio Switch Splitter selector designed for all types of audio amplifiers, DVD stereo speaker, player, game console ,TV ,headphone etc. Colour:Black Material:Aluminum alloy Size:11cmx9.5cmx4.5cm/4.33inchx3.74inchx1.77inch Package Contents: 1 * Audio Switcher 1 * Audio Cable 1 * English instruction manual 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.