Sennheiser HD 219 Headphones Black (Certified Refurbished) This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 90 day warranty Powerful neodymium magnets for stereo sound with powerful bass Optimized for portable audio includingMP3, CD players, iPad, iPod and iPhone Closed on-ear headphone design blocks outside noise