This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 90-day warranty Advanced build quality and engineering, Tuned for enhanced detail, with excellent mid-range definition 40 mm drivers with rare earth magnets and copper-clad aluminum wire voice coils

HEADPHONES ON, NOISE OFF: Significant ANC technology effectively quells airplane cabin noise, city traffic or hubbub in a busy office, helps you focus on what you want to hear, enjoy your music, movies and videos. The noise cancellation function can work well both in wire and wireless mode. NATURAL HD SOUND: High precision-engineered 40mm stereo drivers combined with advanced Bluetooth CSR chipset deliver powerful and steady audio. Otium Active Noise Cancelling around-ear headphones give a powerful and crisp sound, making your overall listening experience much better. OVAL EARMUFFS ERGONOMIC DESIGN: 90° swiveling ear cups & extendable arm & adjustable foldable headband not only designed for saving your desk space but for helping the headphones fit snugly to your head, professional Protein Earpads lengthen the wearing time with comfort. An ideal music companion for traveling.