The Altus Brands Rifleman Series is a rugged line of electronic hearing protection/amplification muffs. The slim, lightweight Rifleman ACH series offers a high NRR of 21 and a crisp, natural sound quality. The Rifleman ACH is perfect for indoor and outdoor use. Each unit weighs 8.3 ounces, features a slim, adjustable headband that is easily worn with combat helmets as well as caps and other headgear. The compact unit folds into itself for easy carry and storage. Each cup is also fitted with Receiver/Input capabilities for: AM/FM Radio, CD or MP3 Player, many FRS radios or electronic communication/entertainment devices using a 3.5 mm mini jack. Each cup has its own electronics and accepts two standard AAA batteries. The Rifleman Series is a rugged line of electronic hearing protection/amplification muffs. It is comfortable to wear for long periods of time to amplify low sounds and protect the user against loud noises such as machinery and firearms. The series is made with the firearms shooting/tactical professional in mind but is perfect for use under most high noise environments.