PH-100AC ANR aviation headset with Active Noise Reduction, Clear Hear performance audio speakers, dual volume control stereo, and easy access AA battery box with mono switch. Comfortable half Gel half foam ear seals;Adjustable spring steel headband;Clear Hear ANR audio technology blocking out the background noise;All new designed noise cancelling microphone and wind block foam mic muff.Pilots and flight instructors will enjoy the PH-100AC ANR aviation headset Brought all day comfort.

PH-100AHC Active Noise Reduction (ANR) Headset is designed for Helicopter pilots who take flying seriously. Using the newest sound technology,Active noticeably reduces cockpit noise up to 52db. So you can fly longer, more comfortably, in a quieter environment. Battery Box With S/M Switch.The headset will shut-off automatically when the headset is unplugged from the battery box or is manually turned off using the toggle switch on the battery box. The headset will also automatically turn off when the radio or avionics master switch is turned off.