The Low-Profile E-Max(R) hearing protection combines great circuitry with a low profile ear-cup that's ideal for shotgun shooters and action shooters. The E-Max(R) amplifies 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.Features 23db Noise Reduction Rating, Dual microphones Adjustable volume control Amplify sounds below 85 decibels, above 85 decibels, the microphones instantly shut off to protect the shooter's hearing Audio input jack True stereo amplification delivers maximum volume and clarity