The product uses relay to switch signals, and the sound quality is not wasted.
Power supply: DC 7-30V AC6-20V
It has no signal amplification function, just switching signal source.
It supports four channels of audio input and uses function switches can control the output of signals.
On the board of the function switch, there are four kinds of led lights, which correspond to different audio inputs, The switching order of thr audio signals is clockwise or counterclockwise.(A→B→C→D,
1 x DIY Relay 4-way Audio Input Signal Selector Switching Kit