Achieve peace and quiet with these noise-canceling headphones from Pyle. The PHPNC45 reduces background noise in any environment. They're ideal for use while traveling - on planes, trains, and buses alike. The closed-style headphone forms a seal around your ear as a first wave against noise - then, if you choose, turn on the active noise canceling technology to further reduce outside ambient noises up to 20 dB. The 40mm drivers provide massive bass, clear mids, and tight highs. And when you're not using them, store them in the included hard carry case. Requires 2 x AAA batteries.