Opened once, but it's new and unused. There are sticker marks on the outer box. optime105 3M hearing protection (earmuffs) that conforms to JIS standards. According to the "Guidelines for the Prevention of Noise-Induced Hearing Loss" enforced since October 1992, workplaces that perform noisy work are required to regularly measure noise levels. If the results exceed 85dB (decibels), employers are obligated to strive to improve the work environment and provide workers with hearing protection as needed. Furthermore, hearing protection devices are subject to JIS standards (JIS T8161), and are categorized into earplugs and earmuffs. Among them, the "3M Hearing Protection Earmuffs JIS Compliant PELTOR" are JIS compliant products that specify the sound attenuation performance values that meet JIS standards. To protect your precious ears from noise Noise-induced hearing loss is a condition where, after years of exposure to noise exceeding 85dB (decibels) in workplaces, the "hair cells" in the "cochlea" of the ear gradually deteriorate, making it impossible to transmit sound to the auditory nerve, resulting in hearing loss. Since there is no cure for noise-induced hearing loss, the only way to prevent it is to reduce noise and use appropriate hearing protection. The "3M Hearing Protection Earmuffs JIS Compliant PELTOR" achieves high sound attenuation performance and protects your precious ears in noisy environments. The importance of preventing noise Noise-induced hearing loss is painless, and the extent of the damage cannot be seen. Also, the knowledge that hearing loss occurs gradually is not widely understood. The "3M Hearing Protection Earmuffs JIS Compliant PELTOR" is a product that protects your ears from noise.