3M Optime III H540
Developed for use in extremely noisy environments. Based on new technology with a double casing that minimises resonance in the holder casing. Acoustic connection between the inner volume and the volume between the casings in its turn provides maximum low-frequency muffling. Broad sealing rings filled with soft plastic foam for the best fit and low contact pressure.
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For Headband- SNR 35dB, CE EN 352-1, For Neckband- SNR 35dB, CE EN 352-1, For Helmet- SNR 34dB, CE EN 352-3
H540A(Headband) H540B(Neckband) H540P3E(Helmet)