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Why choose Awesafeus Electronic Earmuff? Safety Awesafeus Electronic Earmuff offers the ultimate in safety and ear protection. The safety is delivered through distortion-free amplification (up to a safe 82 dB) of important low level sounds like range commands and conversation. The protection comes from the instant blocking of any noise above 82 dB. Quality and Technology Insurance Our over-the-head ear muffs are engineered to work in harsh environments. Two layers of professional noise dampening circuit board, high sealing solid cup and the unique double-shell are used, all combined to achieve an industry-leading NRR. Specification Operating Temperature: 50℃~0℃ Power Supply: 2AAA batteries (Included) Sound Volume: Max. 82dB Ear Cushion Material: Sponge Package Contents: Electronic Earmuffs with Travel Storage Carrying Case Bag × 1 User Manual × 1