PH-100HC ANR Helicopter Headset reduces the unwanted ambient noise in the cockpit by using both Passive Noise Reduction (PNR) and Active Noise Reduction (ANR).use this technology, low frequency ambient noise is significantly reduced and important communication can be heard in a clear, crisp manner.
PH-100HC will continue to operate as a PNR headset should the ANR become inactive for any reason such as low or no battery power.