Features: brand new and high quality 4-Port R/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 for play; no external power supply required; no impact on sound quality 2 in 4 out/ 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 / 4 In 2 Out Cable length：approx 10M/ 32.8ft System: supports for Windows xp Interfaces: R/L Jacks Dimensions:approx 107x 92x 40mm/4.21x3.62x1.57in Material：Metal Package Includes: 1 PC x RCA Stereo Audio Switch note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.