For years Bose has mastered the art of noise cancelling headphones, creating top quality speakers that boast amazing sound and offer some of the best noise cancelling technology that goes above and beyond the competition. But in the past their noise cancelling headphone line consisted predominantly of over-ear setups that were highly effective but a bit clunky, especially if you are using them during workouts, on the train, or really anywhere but home... But now Bose has stepped their game up and introduced the QuietComfort 20i Acoustic Noise Cancelling Headphones, featuring the same top notch sound and noise cancelling technology but in earbud form. You will not find a better range in sound or noise reduction capabilities in such a small package. Other features include 'Aware mode' for hearing what's around you while enjoying your music, microphone that is compatible with smartphones, (Ideal for iPhone, iPod and iPad), and a long lasting rechargeable battery.