The Bose® A20™ Aviation Headset was designed to be worn for many hours at a time while in the demanding cockpit environments of military, general and commercial aircraft where high noise can impede audio clarity. Features such as an audio jack and a Bluetooth phone interface, enable users to utilize hand-held traffic alerting systems or GPS systems, as well as call local air-traffic-control facilities when unable to reach them via line-of-sight radio systems.