Peltor, sport tactical 100 earmuff, electronic hearing protectors, 22 db noise reduction rating, adaptive frequency response reduces background noise for clearer conversations & hearing of commands, variable suppression time feature provides optimal echo reduction in indoor shooting environments, re-engineered headband for improved fit & comfort, low profile cups for rifle/shotgun use, polyurethane gives excellent protection with wet jobs, 2 hour auto shut-off, easy access battery door with tether, runs on 2 "aaa" batteries not included, 3.5 mm audio input jack compatible with most mp3 & 2-way radios, ideal for both indoor & outdoor shooters & hunters.