Shut out the world and lose yourself in your music - or let the world in. It's your choice with the first in-ear noise cancelling headphones from Bose. The Quiet Comfort 20i 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 choose Aware mode to continue enjoying your music while also hearing what's going on around you. Inside these advanced headphones, exclusive Tri Port technology brings your music to life. Additional exclusive technologies provide dramatic noise cancellation rivaling any full-sized headphone on the market today. The proprietary Stay Hear+ tips create a soft, secure fit - with no need to force them into your ears. The inline mic/remote lets you easily control your iPhone, iPod or iPad. 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. What's in the Box Quiet Comfort 20i Acoustic Noise Cancelling headphones 3 pairs Stay Hear+ tips (S, M, L) Clothing clip Rechargeable lithium-ion battery and USB charging cable Carrying case.