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 weighs 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, Type: Active Noise-Cancelling, On-Ear.