This is a bidirectional switcher for L / R channel audio ports. L / R Audio selector designed for customers having several audio sources and outputs.Main function:1. Select audio input between 1 and 2 with 1/2 switch on the front and get one output;2. Select audio output between 1 and 2 to receive one input;How to use:1. Connect two audio sources (like CD player / computer) to 1/2 ports and one audio output (like speakers) to IN/OUT port;2. Connect one audio source to IN/OUT port and two audio outputs to 1/2 port; Note: Select 1/2 switch to switch the input or output you want.Features:Easy installation and simple operation.Only need to lightly press to mute the device; very useful under special conditions.Plug and play; No power supply and other software required; Won't affect sound quality.compact and super mini size; Easy to place and suitable for your desktop and office.Package include:L / R Stereo Audio Switcher x1