![]() But in just the past few years, it's been shrunk down to earbud size. ![]() The technology used to be restricted to full-size over-ear headphones. The technology works best in environments where there's a sustained din, like the droning of a jet engine - which is why Bose ANC Earbuds became a status symbol at airports. Active noise cancellation headphones, also known as ANC headphones, produce a mirror image sound wave in your ear to electronically counteract or "cancel out" external noise.
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