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Spend a lot of time in planes, trains, or automobiles? Do you reside in a noisy home or neighborhood or work in a noisy office? The HP/NC-II 'phones deliver a superior sound in any environment by reducing continuous external background noises up to 15dB. They include a dual-pin adapter for airline headphone jacks, an on/off control, and a single-sided cord that reduces tangles. Comfortable and lightweight (only 3.7 oz.), the compact, over-the-ear, folding design slips easily into the included travel pouch. Delivers over 50 hours of use with 2 AAA batteries.