ASUS NC1 active noise canceling headphones are a great fit for commuters, travelers, office workers & students who require high quality personal audio. The NC1 headphones feature advanced ANC technology that filters ambient noise. They actively detect environmental sounds such as engine noise & railway vibration, & generate inverse sound waves to cancel these out. The NC1 headphones achieve high fidelity audio through use of 40 mm speaker drivers with specially selected neodymium magnets that ensure faithful reproduction & dynamic bass performance in every usage scenario. With ANC enabled, the NC1 headphones work much longer on a single battery. Users can turn ANC off to enjoy the NC1 headphones battery-free, retaining high sound quality in music, movies & voice applications when usage in quiet environments eliminates the need for battery power. The NC1 headphones use lightweight materials & a fold-flat design that renders them very easy to carry & fit into even small bags. The use of breathable protein leather-covered memory foam contributes to user comfort during extended listening sessions & extra-long commutes, including long-haul flights.