Features 1.This product uses relays to switch various signals, basically achieving zero loss. Wide range of applications, suitable for computers, TVs, mobile phones, for Xbox, home theaters, etc. 2.Support four groups of input signals, with the signal switch knob, you can choose to make one of the signal output work. 3.The input signal interface board is a small board composed of two groups of signals, and the input interface of each group of small boards has screw holes for flexible installation and fixation. 4.The audio input switch module is compact, with more convenient installation! 5.There are high quantity terminal blocks for easy wire connection. The audio input switch module is lightweight and easy to install Specification Item Type: Audio Input Switch Module Voltage: DC 7V-30V, AC 6V-20V Function: Four inputs and one output (four groups of audio signals are simultaneously connected to one group of signal outputs) Method: Manual switch Sequence: Clockwise A→B→C→Dor counterclockwise D→C→B→A Features: Zero loss of relay switching Application: PC, TV, mobile phone, for Xbox, home theater, etc. Package List 1 x Volume Adjustment Board 1 x Audio Source Switching Board 1 x Signal Board 6 x Line