Features4-Port R or L Stereo audio switcher: two-way switching splitter audio sharing active speakers The 4-channel switch knob, completely isolates independent circuits, ensuring that each signal is not affected by the other three channels. Plug and play no external power supply required no impact on sound quality 2 in 4 out or 4 in 2 out bi-directional switch, each output volume is independently controlled. Share a single stereo source, no audio crackle- minimal distortion at highest volumes. No loss of signal when all four ports connected. Specifications: Model: GV- AC004A Item: 4 Way Bi-Directional RCA Stereo Audio Switch Support: 2 In 4 Out or 4 In 2 Out System: supports Windows xp Interfaces: R or L Jacks size: about 107 x 92 x 40mm Material: Metal colour: black Package Contents: 1 x RCA Stereo Audio Switch 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.