SPORT RIDGE® Compact Elite Ear Muffs™ are the next step in hearing protection. The internal electronics allow the shooter to listen to his or her surroundings without having to remove their protection. Once the shooting starts, the sound enhancement system shuts off. The Compact Elite Ear Muffs™ offer a single volume control, powered by two AAA batteries. Compact Elite Ear Muffs™, comes with an auxiliary plug for listening to Two-Way Radios or other electronic devices..