①. Features: 4-Port R/L Stereo audio switcher: two-way switching splitter audio sharing active speakers. ②. The 4-channel switch knob completely isolates circuits, ensuring that each signal is not affected by the other three channels. ③. Plug and play; no external power supply required; no impact on sound quality. ④. 2 in 4 out/4 in 2 out bi-directional switch, each output volume is independently controlled. ⑤. Share a single stereo source, no audio crackle- minimal distortion at highest volumes. No loss of signal when all four ports connected. ⑥. Specifications: Model: GV- AC004A; Item: 4 Way Bi-Directional RCA Stereo Audio Switch; Support: 2 In 4 Out / 4 In 2 Out; System: supports Windows xp; Interfaces: R/L Jacks; size: about 107 x 92 x 40mm; Material: Metal; colour: black. ⑦. Package Contents: 1 x RCA Stereo Audio Switch. Only the above package content, other products are not included. ⑧. 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.