3M | 3M noise-canceling earplugs 312-1250 sound-isolating earplugs Sleeping Learning Factory noise-proof earplugs Hearing Protection.

Product name: 3M 312-1250 noise reduction bullet earplugsNoise Reduction Value: SNR=36dB NNR=33dBFeatures: longer rebound time, softerMaterial: FoamSize: 0.47 in * 0.94 inUsage range Noisy environmentSuggested Use: Replace once every 1-3 days depending on the frequency of use.Product Reminder!3M Noise Protection Earplugs reminds you that it is recommended that you change your earplugs every 1-3 days, depending on the frequency of use.If the cold temperatures at your delivery location cause the 3M earplugs to become hard, place the earplugs in a warm room to allow them to warm up, or use the warmth of your hands to make them soft again. Once the product is soft, you can wear it normally.Usage: The earplugs will be rubbed into strips with fingers, stuffed into the inner ear (completely stuffed, if there are exposed earplugs will affect the sound insulation effect) and wait for 60 seconds to make it fully expanded (due to the size of the human ear canal is different, 60 seconds is the earplugs all the expansion of the time. Normal use in about 30 seconds can completely fill the ear canal) specific time please decide according to personal circumstances.The above two packages are 3M312-1250 earplugs genuine!