Active Noise Cancellation (ANC) cancels the noise you don’t want to hear; HearThrough (our word for transparency mode) lets in the sounds you do The Elite 85t buds have been engineered with the most cutting-edge noise cancellation technology on the market, to give you complete control over how you hear the world around you Fully adjustable HearThrough lets you choose how much of the outside world you want to let in using the handy slider, and then access that setting at the touch of a button Active Noise Cancellation (ANC) cancels the noise you don’t want to hear; HearThrough (our word for transparency mode) lets in the sounds you do Our advanced digital ANC uses two microphones in each earbud to cancel the noise you don’t want to hear before you hear it