Pro Ears Pro Mag Gold Electronic Ear Muffs 30 dB Black. The large style cups provide exceptional protection with an NRR (Noise Reduction Rating) of 30. These units have automatic shut-off after 4 hours of inactivity to preserve batteries super soft and comfortable Pro Form leather ear seals exclusive DLSC technology and dual circuit boards for true audiophile sound quality. Specifications for Pro Ears Pro Mag Gold Electronic Ear Muffs: Manufacturer: Pro Ears Color: Black NRR: 30 dB Quantity: 1 Pair Size: One Size Battery Life: 250 hours Additional Features: Adjustable Included Accessories: Standard Condition: New Age Group: Adults Weight: 13.5 oz Features of Pro Ears Pro Mag Gold Hearing Protection Headset Gold Ear Muffs Features military grade dual circuit boards gold connectors for high quality audiophile sound; Fast attack time of 1.5 milliseconds; Exclusive DLSC Compression Technology; Automatic shut off after 4 hours of inactivity; Ideal for range masters and NRA shooting instructors; Best firearms shooting protection in covered or indoor shooting ranges; Use with an caliber handguns or pistols; Large ear cup designed for extreme noise environment - maximum hearing protection; Pro Form Leather ultra comfortable ears seals & padded adjustable headband; Ships in Certified Frustration Free Packaging; Five (5) Year Warranty Package Contents: Pro Ears Pro Mag Gold Electronic Ear Muffs Batteries 3.5mm input jacks for phones and MP3 players Pro Ears GSDPMB: Pro Mag Gold Electronic Ear Muffs 30 dB Black