Turns a 3.5 mm combo headphone/microphone port into two distinct ports - one 3.5 mm headphone jack and one 3.5 mm microphone port, allowing you to connect an external speakers/headphone and microphone to your PC, laptop, tablets or smartphones with a single 3.5 mm 4pin combo port Compact design for maximum portability - a great solution to have on hand in your laptop bag Gold plated connectors resist corrosion and ensure optimum sound quality Note, Does not work for iPhone headset