Lose yourself in your music: QC20 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 plus 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. Tune in to your environment: 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. Engaging sound: 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 & center. Advanced ear tip technology: & your music's even easier to enjoy when you're not fussing with your headphones. Proprietary Stay Hear plus tips create a soft, secure fit with no need to force them into your ears. The cone shape spreads contact evenly across the ear for maximum comfort, & forms a gentle seal that contributes to the headphones' full-spectrum noise reduction. You're in control: Controls are all at your fingertips. Use the slider switch on the control module to turn noise cancelling on & off. The inline microphone/remote houses Aware mode & call answer/end buttons. The 4-button remote, provides volume & music control plus access to voice-recognition apps, like Siri or Google search. Rechargeable battery: The lithium-ion battery charges in just 2 hours with the included USB (Universal Serial Bus) cable, & delivers up to 16 hours playing time per charge. A battery indicator light displays power status. &, even if the battery dies your music still plays with performance equal to that of our regular in-ear headphones. When not in use, simply store your headphones & cables in the included carrying case. Also known as: BOSE QUIETCOMFORT QC20, BOSE QUIETCOMFORT QC-20, BOSE QC20, BOSE QC-20, QUIETCOMFORT QC20, BOSE QUIETCOMFORT QC20 BOSE