https://phys.org/news/2018-10-microsoft-unveils-surface-devices-headphones.html > The ear-covering headphones don't yet have a for-sale date—the company will say only they are coming "soon." They'll be priced at $349. > The Surface team has been developing the headphones for about three years, said Robin Seiler, general manager of Microsoft devices. They are intended to "create space" for the wearer, and some of the 13 levels of noise cancellation allow for the wearer to still hear people's voices near them while blocking out background noise.