Peltor Sport Tactical Electronic Hearing Protector earmuffs have lowprofile cups for rifleshotgun use to suppress gunshot noise and amplify low sounds using proprietary 3M technologies and have an auto shutoff 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 reengineered headband for improved fit and comfort tethered easyaccess battery door for 2 AAA batteries not included twohour auto shutoff to conserve battery usage 3.5 mm audio input jack compatible with most mp3 players and 2way radios and an improved 22 dB NRR. The Tactical 100 Electronic Hearing Protector combines innovative 3M technology with the Peltor Sport Brand to give shooters and hunters an excellent hearing protection experience.