I have a pair as well, and like them a lot.NoizeBarrier Micro High Definition Electronic Earplugs Hearing Protection
The NoizeBarrier Micro high definition electronic tactical earplugs offer active hearing protection as well as hearing enhancement for extremely effective sound localization and detection. Gun range hearing protection.www.otto-comm.com
Otto noise barrier micros work great. Started with Howard Lieght muffs, went to a set of Axils plugs, and finally got a pair of Ottos. They're the best I've tried. Good for range use and hunting.