MSA Sordin Supreme Pro X - Premium Edition - Electronic Earmuff with black leather band, green cups and gel seals fitted plastic, steel, metal Imported MSA Sordin Supreme PRO X - US Military grade earwear Equipped with MSA Sordin Supreme GEL Comfort Earseals AUX input for connection to external radios, mp3 players, phones, etc. Noise Reduction Rating (NRR): 18dB - Great for hunters, shooters, and those working with loud machinery Very low battery consumption: 600 hours of battery life