CALDWELL LOW PROFILE CAMO ELECTRONIC EAR MUFFS - SKU: CALD-ELPMO 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 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.Two microphones - one in each cup - give the user true stereo sound and allow the user to identify the directional source of a sound. Runs on 2 AAA batteries (not included). 23NRR