Big over-ear headphones, like the kind companies like Bose and Beats made their names in, are often what we think of first when we think of noise cancellation. Encircling your ear to create a seal, it's no wonder that in addition to feedback mics to cancel out incoming noise, the cup itself creates a great barrier. But increasingly, as smartphones and tablets swap headphone jacks for some sort of wireless audio output, a lighter weight, more compact, noise cancelling solution has taken hold in the form of earbus. While smaller, it doesn't mean they don't do an excellent noise of keeping unwanted sound out, and you locked in to your audio.
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