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Sync Stereo Earmuffs with Audio Input Jack. Most stereo earmuffs provide some level of hearing protection. But often sacrifice sound quality for attenuation. Sync is a stereo earmuff that's in sync with proper levels of hearing protection, high-fidelity sound, and your ability to listen to portable audio devices safely at work and at home. Sync's acoustically optimized ear cup design delivers excellent protection against hazardous noise. Inside, Sync's speaker technology manages sound levels reaching the user's ear to a safe 82 dBA. That's well within OSHA's recommended 85 dBA Action Level. At any workplace, Sync helps keep you motivated, and productive. Sync has no volume knob or power switch to fiddle with, and no batteries to replace, so users can just plug in and go! The system controls volume to safe levels. But users have everything else just the way they want it. They simply plug Sync into their MP3 players or other portable audio devices. They turn on and off power and adjust volume through their portable audio devices, too. Sync's DJ-inspired earcup design and sound quality are on par with other professional and high-end personal headphones on the market. Sync boasts the most stylish design of any industrial earmuffs you've seen with hearing protection that beats any entertainment headphones on the market.