1. Excellent FM radio performance and bass enhancement options to enhance the listening experience. 2. 30db noise reduction level and sound activated compression can protect ears from the damage of gunshots and heavy machine noise. 3. Adjustable headband ensures wearing safety, compact design for easy storage. 4. Audio input socket for listening to MP3 players or smart phones; built?in volume control knob, convenient to use. 5. Audio assist technology can help you program multiple AM/FM radio stations and notify you when the battery is low. 6. Soft and thick headband with low?key appearance, comfortable fit, good toughness, make the earmuffs close to the ear. 7. Powered by 3pcs AAA batteries (not included), full body spray rubber oil, brings comfortable and high?end touching feel.