Peltor Tactical 100 foldable electronic earmuffs (NRR 22dB) feature an adjustable, padded headband and soft ear cushions for all-day comfort. Built with proprietary 3M technology to suppress harmful gunshot noise while amplifying low-level sounds. Adaptive Frequency Response reduces background noise for clearer conversations and hearing of commands. Tactical 100 earmuffs run on 2 AAA batteries (not included) and feature 2-hour auto shut-off to maximize battery life. The 3.5mm audio input jack is compatible with most MP3 players and 2-way radios. Mfg: 3m Company