There's actually six pairs of headphones in the series, but these Star Wars R2-D2 headphones, are, for us, the pick of the bunch.
Good for audio players and mobiles (iPhone, HTC, BlackBerry and Sa,sing for example), thew headphones that that R2 styling and the option to fold down when not in use. If you want the full technical breakdown, see the site for details.
Indeed, see that same site for all the headphones in the series. if you want the ones above, 49.90 Euros is the price.