Electret mic' and dual GA plugs
The headset has been completely re-engineered for significantly increased noise reduction in even louder environments. With an improved degree of comfort you will appreciate and the crystal clear audio you expect from Bose.

Key Benefit and Technology Bullets

• 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. These ear seals sit over rather than on 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 ( 340 grms).