1. If your headset does not have a microphone, the red line and the green line are respectively the audio signal output lines of the left and right sound channels of the headset, and the copper wires are both ground wires.You connect the red line to the red line, the green line to the green line, and you can connect the two copper lines to the other two copper lines at will.

2. If your headset is equipped with a microphone, the red line is connected to the red line, the green line is connected to the green line, and the two copper wires on the headset head are connected to one of the copper wires.Check if the copper wire is connected to the headset and if it makes a sound.This wire is a common ground wire, and then another copper wire is welded to a point on the microphone head.However, this is less likely.It is best to sand the paint of these wires first, then use a soldering iron to weld, and then use a small heat shrink tube or tape to wrap the welding part, so as not to short-circuit each other, and finally use a big heat shrink tube to wrap all four wires, bake the heat shrink tube to make it shrink.As long as there is no false welding after welding, the sound quality will not be affected.