The most technologically advanced Bose headset ever. Bose was the first to introduce active noise reducing headsets to aviation more than 20 years ago, forever changing the way pilots fly. Now, the Bose A20 Aviation Headset introduces an entirely new standard. It's been engineered for significantly increased noise reduction and performs in even louder environments. With an improved degree of comfort you'll appreciate. All without compromising the clear audio you expect from Bose. Plus, a Bluetooth communications interface, auxiliary audio input and priority switching.