Plug-in Earmuffs have 25dB NRR
Block out harmful noise while listening to your MP3 player, CD player, communication radio or AM/FM radio with these lightweight earmuffs. Volume adjustment limits the sound produces inside the headset to 85dB for compliance with OSHA requirements. Soft-sealing ear cushions and padded headband make this earmuff comfortable to wear for long periods of time. Coiled cord extends up to 5'. Features larger speakers for excellent sound quality and includes 2.5- , 3.5- and 6.4mm plug adapters. 25 dB NRR. No batteries needed. Imported.
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2016 Master Catalog: Page 55