Sony XBA-NC85D Headphones is the smallest and lightest noise cancelling in-ear headphones. With a revolutionary box-free design, this XBA-NC85D Balanced Armature in-ear headphones reduce ambient noise in airplanes, offices and other environments by up to 97.5% so you can enjoy your music in peace. Slip into sublime sonic bliss with a premium blend of crisp, radiant highs and deep, breathtaking bass-delivered to you absolutely unadulterated and delightfully distraction-free. The ultra-compact design of the Balanced Armature driver allows for a natural in-ear fit and improved, long-term comfort. Enjoy up to 20 hours of audio thanks to the internal rechargeable battery. Travel case, USB charger adapter, in-flight plug adapter, cord adjuster and clip included.