Consider them your go-to headphones, wherever you go. The first in-ear noise cancelling headphones from Bose give you more control over how you listen than ever before, in all kinds of environments. Block the outside world with full-on noise reduction. Or, choose Aware mode & let some of it in-all while keeping your headphones on & your music alive with lifelike Bose sound. Wherever your day takes you, QC20 headphones keep you connected. To the beat of your music, & the pulse of what's around you. The Quiet Comfort 20i headphones let you experience music on the go as never before. You'll enjoy lifelike, digital sound quality that stands out from the noise around you-plus the freedom of an in-ear headphone. Stay Hear+ tips physically block some noise while our Acoustic Noise Cancelling technology electronically reduces most of what's left. It's just you & your music, even in noisy environments. But there are moments when you may not want to be so cut off from your surroundings. Crossing a city street, waiting for airline gate announcements. This is where Aware mode comes in. Instead of removing your headphones, just press a button, & you're back in touch with the sounds around you-while your music keeps playing, & you still experience some noise cancellation. All this, plus Bose lifelike sound. Sound you wouldn't expect from in-ear headphones. Our Tri Port technology & Active EQ combine to give your music a depth & balance that keep your daily soundtrack fresh & alive. The subtle details shine through, too. So wherever you are, your music's front & centre. & your music's even easier to enjoy when you're not fussing with your headphones. Proprietary Stay Hear+ tips create a soft, secure fit with no need to force them into your ears. The mushroom shape spreads contact evenly across the ear for maximum comfort, & forms a gentle seal that contributes to the headphones' full-spectrum noise reduction. Controls are all at your fingertips. Use the slider switch on the control module to turn noise cancelling on & off. The inline remote/microphone houses Aware mode & call answer/end buttons. The 2-button remote (QC20 model) is designed for your Android, Black Berry or Windows phone. The 4-button remote (QC20i model), customised for your iPhone or iPod, adds music control & voice commands.