What happens when you clear away the noisy distractions of the world? Concentration goes to the next level. You get deeper into your music, your work, or whatever you want to focus on. That’s the power of our Acoustic Noise Cancelling technology. It continuously measures, compares, and reacts to outside noise, then cancels it with the opposite signal. And now both QC35 IIs and QC30s feature adjustable noise cancelling, so your music will always sound just right for your environment.