What you want the headset to have is two jacks, one 2.5 mm for your phone and one 3.5 mm jack for your mp3 player.Try searching for this on Amazon:PLANTRONICS MX100S Stereo mobile and music headset. Standard 2.5mm plug for phone, 3.5mm plug for personal multimedia devicesI am still deciding between this one and the Plantronics. I have an LG VX8100 that will play mp3s and I also have an iPod Shuffle. It's a difficult choice because I am a true audiophile that wants good sounds coming through my ears or else I am distracted and cannot enjoy the music at all. If anyone can help me make a choice please post your opinion here or at the Plantronics MX100s page.