The Pro Ears Mag Gold hearing protection and amplification are ideal for indoor and outdoor shooting ranges; most especially for large and small caliber handguns and pistols. 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. Comes with a 5 year warranty and are Made in the USA.