Features: 1The product uses relay to switch signals, and the sound quality is not wasted.2It has no signal amplification function, just switching signal source.3It supports four channels of audio input and uses function switches can control the output of signals.4On the board of the function switch,there are four kinds of led lights, which correspond to different audio inputs.5The switching order of the audio signals is clockwise or counterclockwise.s:Color as shownMaterial: plastic + metal1This is a 4-way Relay Audio Input Signal Selector Switching RCA Audio Input Selection Board of switching for Amplifiers.Specifications:Model Number:-046 supply range: DC 7-30V AC 6-20VNoted:If choose DIY kit, need assemble to work,Please take full consideration to buy.Package Contents:1 x Audio Input Signal Selector SwitchingOnly 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.