●The two switches are completely isolated from the ground, and there will be no current sound and noise ●Usage 1: Two playback devices (switching one player to play) are connected to one Sound. ●Usage 2:one playback device is connected to two amp audio devices (switch one of the amp to use playback). ●The wire adopts 4n OFC, the plug is pure copper gold-plated 24K ●Multiple length selection, bifurcation position in the middle of the wire