Premium speaker system bringing you flawless audio integration on and off the mountain with all 2010 RED adult helmets. The 57mm drivers plug-and-play into helmet ear pads or premium headset. REDphones™ are compatible with iPod™ or other music players and feature on-cord volume/mute control. Add modular audio to any 2010 or 2011 RED snowboard helmet, and use the speakers in the included DJ style headset. Includes premium phones with 57mm driver. Rock on! One size fits all 2010 & 2011 R.E.D. helmets.