Standard profile E-Max hearing protection combines great circuitry with a standard earcup for more better protection. 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 shooters 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.Specifications:Decibel cutoff:85dBNRR:25Power source:two AAA batteries (not included)