Button Function and Wiring: A/B Selector: used to connect the headset to A (PS4, Xbox, MAC, Nitendo etc.) or B (Computer, Phone etc.) Volume Control: to control volume of headphones and multimedia speakers but cannot control microphone Mute Button: Mute both the microphone and headphone (with a set switch) or the microphone alone (can hear others while others can't hear you) Output Setting Switch: Set the audio output to be a headphone or a speaker Wiring: Microphone cable of the headset => red jack; The other cable => green jack; A & B => two different devices like a computer or game console; External powered speaker => speaker output port output port (please refer to the image)Packing List: 1* MC1024 Audio Switcher 2* Headset Cable 1* 3.5 stereo audio cableApplication Scenarios: 1.For game players: Can easily switch between a gaming computer and a game console. And you can also switch between the headset and the speakers freely when you are tired of hearing with a headset. The mute button is also very practical while answering call or communicate with others. 2.For bloggers chatting on-line: most bloggers have more than 2 chat website accounts. This switcher also can be used between two chat software or devices. You can wasily switch between your computer and phone to communicate with different people. 3.For work meetings: If a desktop computer and a laptop are at work at the same time, the MC1023 can easily switch between your desktop and laptop voices. 4.For music studio: This converter can easily switch between two different sources to a recording device to achieve mixing effect. (Note: The headphone jack and microphone interface are stereo so there are 4 channels of audio signals that can be simultaneously switched).