Zohan Em054 Electronic Shooting Earmuffs designed for shooting lovers With ultra light weight and soft headband design it will not cause discomfort if worn for a long time; The NRR of passive noise reduction is 22 dB which can effectively reduce the damage caused by loud noise. If you turn on the power it will actively amplify the surrounding sound below 82 dB so wearing headphones will not affect your normal communication. If the surrounding sound is higher than 82 dB it will reduce the noise within 0.01s and effectively protect your ears. Zohan earmuffs also have stereo positioning to ensure you a enjoyable shooting experience. In addition zohan also has independent volume adjustment button four-hour automatic power-off setting replaceable ear pad design and easily-open battery box cover for battery replacement.