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. Ear cup width is 1.75 inches and two AAA batteries are required but not included. Enabled with one stereo microphone in each cup, the user is able to localize sound from all directions. The glasses blocks 99.9% of harmful UV rays. One year warranty against manufacturing defects.