It's external. Example at http://www.amazon.com/Plantronics-PC-Headset-Speaker-Switch/dp/B000069E1V
I have some Plantronic headphones I got for my Dell Inspiron 560 desktop and can't seem to get audio out of any connection in the back of the computer. I do have speakers hooked up and they work fine. I know the headphones work as I plug them into my MP3 player and get signal. There are actually 6 in/out slots in back for audio as follows: rear L/R surround side L/R surround microphone front L/R line out (speakers are connected here) line in center/subwoofer I've tried the headphones in every output connector including the front l/r line out and I get nothing. Am I doing something wrong? Or do I have a hardware problem? What is the proper configuration if one wants to have both speakers and headphones connected to a computer or is that not possible? Thanks for any direction and/or suggestions.