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Product Details:- *For noise levels up to 101 dBA *Stainless steel band distributes weight for low-pressure fit. *Noise Reduction Rating (NRRA Class A.): 26 dB . CS *The NRR may overestimate the hearing protection provided during typical use. 3M Peltor Optime 101 behind-the-head earmuffs fit well with most helmets, eyewear and other safety equipment. For noise levels up to 101 dBA, these behind-the-head earmuffs provide effective hearing protection. Stainless steel band distributes weight for low-pressure fit. Earcup pivot points that tilt for optimum comfort and efficiency. Liquid/foam filled earmuff cushions. Color-coding for compliance sighting. Noise Reduction Rating (NRR): 26 dB . CSA Class A. The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided. 3M is Leading the Advancement of Hearing Conservation. *Usage/Application: Noise Redection *Color: black *Charging time: 1 Hour *Brand: 3M *Packaging Type: Box *Battery Life: Approx 20 hours *Hearing Protection Style: Behind the head *Hearing Protection Type: Headband