Turn your favourite 3. 5mm jack stereo headphones into your very own Vo IP phone using the Kit Data in line USB (Universal Serial Bus) microphone. Simply connect your headphones (not included) to the adapter then plug into the USB (Universal Serial Bus) port of your laptop/PC. Youre then free to listen to the music on your laptop or chat away on Skype Yahoo or Voice Microsoft Messenger using the high quality microphone features. The omni directional microphone & volume control ensures uninterrupted conversation & quality sound. The adapter also features both a microphone on/off & a mute switch for added convenience.