Wide-spectrum Active Noise Reduction & closed ear-cup design promote pleasant travel by virtually eliminating unwanted noise High performance 40mm neodymium drivers deliver superior quality audio reproduction Adjustable deluxe padded headband & leatherette ear pads for long lasting comfort Features foldable design for easy packing handy multi-function controller carry bag with accessory pouch two choices of cable lengths as well as airline & 0.25 adaptors The superb sounding Altec Lansing AHP712 headphones with Active Noise Reduction are ideal for the frequent traveler & anyone in a noisy environment. Active Noise Reduction technology uses small microphones to listen to ambient sounds & special circuitry to create a sound wave 180 degrees out of phase from the ambient sounds. When the sound wave is played through the headphones it reduces ambient noises such as airplane engines & subway rumbles to allow you to focus on your music movies or games.