Peltor Sport Tactical Electronic Hearing Protector earmuffs have low-profile cups for rifle/shotgun use to suppress gunshot noise and amplify low sounds using proprietary 3M technologies and have an auto shut-off feature. The Tactical 100 Electronic Hearing Protector is ideal for both indoor and outdoor shooters and hunters with improved performance enhanced comfort features enhanced electronics and greater functionality. Adaptive Frequency Response reduces background noise for clearer conversations and hearing of commands and the Variable Suppression Time feature provides optimal echo reduction in indoor shooting environments. These earmuffs offer a streamlined design including re-engineered headband for improved fit and comfort; tethered easy-access battery door for (2) AAA batteries (not included); two-hour auto shut-off to conserve battery usage; 3.5 mm audio input jack compatible with most mp3 players and 2-way radios; and an improved 22 dB NRR.