MOS Reference: Electronic hearing protection earmuffs with sound-activated compression that amplifies ambient sounds below 82dB for situational awareness while instantly attenuating harmful impulse and continuous noise. Dual directional microphones provide stereo sound localization so you can hear conversations, alarms, and equipment warnings clearly. NRR 22dB passive protection engages even with depleted batteries. 3.5mm auxiliary input jack for connecting to radios and communication devices. Runs on 2x AAA batteries with automatic 4-hour shutoff to conserve power.