3M Peltor Optime II Cuffie auricolari protezione udito H520A-407-GQ classe 2 Brand_Lotto - Filter efficiency of 99

- Filter efficiency of 99

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3M Peltor Optime II Cuffie auricolari protezione udito H520A-407-GQ classe 2 Brand_Lotto - Filter efficiency of 99Headphones Hearing protection Optime II Optime II are headphones with high performance acoustic protection developed for use in extremely noisy environments. The protection is based on a technology with a double casing that minimizes resonance in the containment envelope For maximum attenuation of high frequencies. An acoustic connection between internal volume and volume between the casings in turn ensures maximum attenuation to low frequencies.