We're in the 21st century. Any quality operator should be ordering their helicopters with powered ANR headset jacks, and retrofitting their fleet with ANR. Pilots having to pack around their own ANR running off battery packs is OK for a General Aviation Piper Cub rental, but does not make the grade for a commercial/corporate operations. It just isn't that expensive to have those extra jacks to power ANR headsets in the cockpit.
malabo