If all you want is a way to listen to music or the voice commands of your GPS, you don't need a complicated, expensive helmet communication system. These wafer-thin 6mm padded Hi-Fi stereo speakers are designed for full-face, flip-up, and open-face helmets. Cords tuck neatly into your helmet lining. A removable coiled cord with a waterproof USB connector plugs into any 3.5mm audio jack.
Note that most MP3 players have been designed to work with earbud-style headphones. With the HS200 speakers recessed well into the ear pockets of your helmet, your device may not have sufficient volume to be heard over wind and engine noise. In some cases, it helps to insert a thin layer of foam before mounting the speakers, to bring them closer to your ears.