dr. Tech ANC-125B High-Grade Active Noise-Cancelling Headphone with case Advanced noise-cancelling design offers 85% noise reduction for superior listening Noise-cancelling can be switched on/off, and is powered by AAA battery for up to 50 hours use Double housing for sound insulation; foam-cushioned ear pads for comfort and further isolation Headphones weight just 5.3 ounces, and fold flat to fit in included carrying case Includes four-foot detachable cord with airline and 1/4-inch adapters