Shut out the world and lose yourself in your music - or hear what's around you. It?s your choice with the first in-ear noise cancelling headphones from Bose. The QuietComfort® 20 Acoustic Noise Cancelling® headphones are engineered to let you enjoy better sound every day, everywhere you go. Turn on noise cancelling to reduce surrounding distractions and focus on your music. Or, at the touch of a button, activate Aware mode so you can hear what's happening around you without removing the headphones. Inside the QC®20 headphones, exclusive TriPort® technology brings your music to life. Additional Bose® technologies provide dramatic noise cancellation rivaling any full-sized headphone on the market today. Proprietary StayHear+ tips create a soft, secure fit - with no need to force them into your ears. The inline microphone and remote let you switch to calls on your iPhone, and provide control for select iPod, iPhone and iPad models. The rechargeable lithium-ion battery provides up to 16 hours of use, and a USB charging cable is included. And even when the power is off or the battery runs out, you can still use these headphones to enjoy Bose® quality sound.