This Bose A20 Aviation Headset has the single U/174 NATO type Plug connection for Helicopter use. Bluetooth phone and music is built in to the slim, stylish battery and volume module.
Based on the industry standard H10-13.4, this ANR Active Noise Reduction version provides outstanding hearing protection, with low frequency noise cancelation of an additional 17-22 dB over the units standard passive performance of 23dB.
Also fits Bose X