When you have multiple audio devices that need to share audio or amplifiers, several devices can be connected to it at the same time, which output is used, and it is convenient and practical without switching.One 3.5mm stereo interface, four sets of RCA interface, one set of RA output, one 3.5mm headphone outputSeveral audio sources can be connected at the same time without affecting each other, and can be mixed or individually output supply DC 5-19V, please use low-ripple supply, poor supply will easily produce humWith gain, the RCA output port is amplified by about 2 times, and the headphone port is amplified by about 4 times.colour: blackMaterial: metalSize: 120x40x45mmPackage Contents:1 x Audio Switch SwitcherOnly the above package content, other products are not included.Note: Light 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.