M31 PLUS Electronic Hearing Protection - EarmorSounds are detected by two directional microphones and reproduced by the speakers inside the muffs. The power source is two AAA battery cells. The new version, model 2024, received new silicone gel earmuffs increasing comfort during long term use. Solid protective headphones The M31 provides audible protection in noisy areas with impulsive noise, such as firearms use zones. The microphones mounted in the earmuffs improve the situational awareness of