Hearing ProtectionPro Range Glasses The Caldwell Low-Profile E-Max Electronic Earmuffs combines great circuitry with a low profile ear cup that's ideal for shotgun shooters and action shooters. The two microphones in the E-Max amplify sounds below 85 decibels, which amplifies normal communication, range commands, and environmental sounds. Above 85 decibels, the microphones shut off for a split second to protect the shooter's hearing. Pair these earmuffs with comfortable shooting glasses and you are set to head out to the range.Comfortable fitAdjustable volume controlAudio input jackFolds compactStereo soundSpeakers shut down at noise levels about 85dBFeaturesAdjustable nose pieceBlocks 99.9% of harmful UV raysImpact resistantMeets ANSI Z87.1 Standards