Sony Premium Lightweight Active Noise Canceling Headphones (White) Active Noise Canceling - Designed to reduce up to 90% ambient noise when noise canceling circuit is activated 30mm Driver Units - 30mm drivers with neodymium magnets deliver powerful bass and clear treble Designed for Comfort - Designed to allow for comfortable wearing over long periods of time Dual Folding Design - Compact for portability yet affording listening flexibility, the dual-folding design affords for easy portability Battery Life - A single AAA battery provides up to 80 hours of listening time