Caldwell E-MAX Low Profile Electronic Hearing Protection Green and Black 487-557 New low-profile E-Max hearing protection combines great circuitry with a low profile earcup that s ideal for shotgun shooters and action shooters. 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