Earplug, dome pressure reduction aviation earplug with canister

Model Number: CUM-01-2-#7835 Brand Name: Aier Key Specifications/Special Features: Aircraft earplugsFitting & care instructions:Gently pull ear outward and upward and insert plug into ear canal with a slight twisting motion. Never use force, allow plug to sit comfortably in ear. If painful, remove and reinsert. Check that plugs filter background noise and retain speech quality. If speech cannot be heard, plugs maybe wrong size or inserted incorrectly. Washwith warm soapy water or 70% alcohol. Keep in case provided when not in use. In case of ear infection or problems, consult a doctor before use.Applications of aviation earplugs:1. Airport dock
2.Watching the fireworks

3.Construction site

4.Processing workshop

5.Bustling downtown

The principle of reduce pressure:
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