The A20 aviation headset is the most advanced Bose pilot headset yet. Its breakthrough innovations reduce more noise and provide even greater comfort than previous models, without compromising the clear audio you expect from Bose. The next-generation pilot headset from Bose. More than 20 years ago, Bose introduced active noise reducing headsets to aviation-and launched an entire industry. Year after year, pilots have made these headsets their #1 preference. Now, the A20 aviation headset introduces an entirely new standard. Enjoy a quieter flight: Proprietary technologies in the Bose A20 aviation headset reduce more noise than ever before, across the full spectrum of human hearing, in even louder environments. Advanced electronics now use microphones both inside and outside each ear cup to sense and reduce more ambient sound. Featuring Lemo connector plug.