The SR112 Earmuffs from SmartReloader electronically limits loud noises to 85 decibels and amplifies soft sounds up to 20 decibels. Stereo microphones allow you to hear directionally, excellent for hunting and range safety. Independent volume controls on each earpiece. Runs on 4 AAA batteries (not included). Amplifies non-harmful sounds as much as 19dB while blocking out harmful sounds (such as a gun-blast). Individual On/Off and Volume controls. Padded headband and soft, foam filled ear cushions. Amplifies the full range of audible sounds up to 100 yards away. The SR112 earmuffs come with a built-in walkie-talkie plug which allows to plug-in your walkie or your music player. Includes SmartReloaders 3 year warranty