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**This model is battery powered, has a straight cord and single U-174 helicopter plug. Also has an electret microphone for civilian helicopter use.**
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Bose did make there older Bose X headset with a coil cord option but not for the Bose A20 line.
The difference is in the impedance of the microphone. The military uses a low impedance (dynamic) standard for it's microphone while the civilian helicopters use the same U-174 plug but with a high impedance (electret) mic.