The Low-Profile E-Max hearing protection combines great circuitry with a low profile earcup 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. Two microphones ? one in each cup ? give the user true stereo sound and allow the user to identify the directional source of a sound. Includes an integrated audio input jack allowing music to be played. Runs on 2 AAA batteries (not included). 23dB Noise Reduction RatingFeatures: 23DB NRR, 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