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Nov 24, 2017 13:11
I bought a earplug, which was specialized in sound proofing or water proofing.

This manufacture is advertising that this product is using by shooting players and swimmers of national team.

In a product guide I had seen on internet, it indicate that by using this product, a low pitched sound like voice will be reduced about 60% and high pitched sound like machanical noise will be reduced about until 60~70%.

When I tested its soundproofing effective after I received a delivery of it at home, I was huge disappointed.

It did not works. !!
(It did not prevent noise around me.)