Low Impedence, Military, Dynamic Noise Cancellation Mic, Battery Power.

• New super soft, double foam headpad
• New comfort gel, undercut ear seals  
• Advanced ENC technology provides 17 - 22 additional dB beyond already superior passive noise attenuation
• Versatility of portable battery powered or permanent mount options using the same headset
• Headband custom adjustment for 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