H10-76XP Permanent Panel Mount - comes with a permanent panel mount module for utilizing the aircraft's power source ELECTRONIC NOISE-CANCELING TECHNOLOGY FOR MILITARY HEADSETS H10-76XP headsets by David Clark are designed to provide the ultimate in comfort and communication. If you are looking for clarity in communication or just safe, quiet flights we recommend this line. These headsets are designed to withstand the rigors of military cockpits. New super-soft, double foam head pad New Comfort gel, undercut ear seals Advanced ENC technology provides 17 - 22 additional dB beyond already superior passive noise attenuation The versatility of portable battery-powered or permanent mount options using the same headset Headband custom adjustment for a perfect fit Dynamic, noise-canceling M-87 microphone for clear, crisp communications. Meets MIL-26542/2 (USAF) specifications. Ideal for aircraft requiring a low impedance microphone Microphone terminal impedance nominally 5 ohms "FAIL-SAFE" operation. Electronically independent earphone drivers permit uninterrupted communication should ENC or its power source fail