Power: It operates on 2 AAA batteries included Headband: It features a comfortable headband with a metal wire frame Compact: It features a compact folding design making it easy to store and travel with Bundle Includes: Walkers Game Ear Razor Freedom Series Muffs (Flag), Hearing Protection and Safety Glasses Case, and Ballistic Protection Glasses (Clear) Sound Activated Compression: SAC is a special electronic circuitry that will compress gun shots and other loud noises down to a safe level, without completely shutting the noise off