The RAYTALK PH-600A : ANR & BLUETOOTH AVIATION HEADSET is an aviation headset with Active Noise Reduction, with clear hear performance audio speakers, dual volume control stereo, and easy access AA battery box with mono switch. Clear Hear Active Noise Reduction audio technology will block out the background noise. Newly designed noise cancelling microphone and wind block foam mic muff. Pilots and flight instructors will enjoy the PH-600 AN aviation headset for all day comfort.