Connect a 4position headset to a computer that has separate microphone and audio ports Connect your newer headsets (audio & microphone) to a PC or Laptop for use with VOIP applications (Skype chat programs) Compact design for maximum portability a great solution to have on hand in your laptop bag Headset Splitter Adapter Cable 3.5mm Headset Splitter Compatible with various laptops that have a seperate mic and audio ports such as the HP ProBook 450 G1 Lenovo Thinkpad T400