PC/Phone Headset Switch allows you to use one headset for both telephone and PC/Soundboard/VoIP applications. Easy to connect! Just plug your headset (either a corded headset like the Vista M22 or S12 or a wireless such as CS50, CS55, CS70) into our switch box and the coiled cord into your phone. The two computer connections plug into your PC's sound card. When the silver button is up on the switch box, your headsets works through the telephone. When the button is pushed down, your headset works with your computer for VoIP, voice recognition or any other computer applications.