ZOHAN EM025 Black 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 25 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. 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.