The Bose A20 headset is one of the lightest and most comfortable aviation headsets with a 30% greater noise reduction and 30% less clamping force over conventional aviation headsets. Active equalization for enhanced audio automatically shapes and equalizes incoming signals for enhanced clarity and intelligibility. Simple, intuitive operation when using the ergonomic control module including an auxiliary audio input with intercom/AUX priority switching. Also featuring a customizable audio prioritization control with “mute” and “mix” settings. The side-swappable mic is able to connect to either the left or right earcup. The A20 headset is certified to FAA TSO C139 standards.