FMA FCS AMP Tactical Headset Communication Noise Reduction Hearing Protection Posted on January 26, 2024 by admin FMA&FCS AMP Tactical Headset Communication Noise Reduction. Headset jack: U-174/U plug. (Don’t include Battery). Noise reduction value: 26dB. PTT Compatible PRC-148/152, FCS-148, U94, PELTOR, US military original communication models.