Tork X-Pro Motorcycle Helmet Speakers (with Volume Control)
The TORK XPRO helmet speakers are the best sounding high volume, thin bodied speakers on the market. Designed specifically for in-helmet use and provides hi-fi sound quality.  The XPRO's are full stereo speakers which plug into any personal AM/FM radio, CD player, MP3, iPOD and iPhone. The speakers are thin and comfortable when mounted inside your helmet. The back of each speaker has hook and loop fasteners that keep it securely in place in most helmet liners. Take them for a ride, you won't be dissapointed!  These speakers include a volume control and have a 1 year warranty.  Specifications:Speaker Enclosure:Dimensions: 2.25" diameter X .38" thickActual Speaker Size:Dimensions: 1.4" diameter X .31" thickImpedance: 32 ohm Max Power: 500 mw 3.5mm connector plug Connector Cable:Stereo music cable: 3.5mm(1/8") plug to 3.5mm(1/8") jack with inline volume control