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 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. It's made in the U.S.A., and meets or exceeds all TSO requirements. No other headset can deliver this advanced combination of benefits.
Features:
- Significantly greater noise reduction for pilots than currently available.
- Improved level of comfort achieved through choice of materials, distribution of weight throughout the headset, 1/3 less clamping force than most conventional noise reducing aviation headsets, and additional room for the ears.
- Clear audio for enhanced communications.
- Now available from Bose for the first time: Bluetooth® communications interface.
- Also included by Bose for the first time: auxiliary audio input.
- Priority switching so pilots can decide which audio source they want to hear.
- At least 40 hours of typical headset use from just two AA alkaline batteries.
- Made in the U.S.A.
- Meets or exceeds all TSO standards.
- All this, and these headsets still weigh only 12 ounces.
* New Comfort gel, undercut ear seals * Battery Power Module - One 9 volt battery for up to 25 hours of operation. * Pilot Selectable Automatic-Shut Off Feature. * Five foot (extended) coil cord terminating with a 10 pin quick release connector. * Coiled cord assembly connects Battery Power Module to panel intercom/radio. * Same headset can be used with optional panel mount. (H10-56XP) * Dual volume controls let you adjust the level for each ear * Exclusive, patented flex/wire boom for easy, precise microphone placement * Super soft foam filled pillow headpad * NRR - 27 dB passive noise reduction rating plus 17 dB to 22 dB when ENC is turned on * Weight (without cord assembly): 22 oz.
The most technologically advanced Bose® headset ever. 
* New Comfort gel, undercut ear seals * Battery Power Module - One 9 volt battery for up to 25 hours of operation. * Pilot Selectable Automatic-Shut Off Feature. * Five foot (extended) coil cord terminating with a 10 pin quick release connector. * Coiled cord assembly connects Battery Power Module to panel intercom/radio. * Same headset can be used with optional panel mount. (H10-56XP) * Dual volume controls let you adjust the level for each ear * Exclusive, patented flex/wire boom for easy, precise microphone placement * Super soft foam filled pillow headpad * NRR - 27 dB passive noise reduction rating plus 17 dB to 22 dB when ENC is turned on * Weight (without cord assembly): 22 oz.