Solutions:
Earplugs isolated well the voice of the outside， to ensure the sound source quality， but because of everyone's ear canal diameter size and different shades， chooses the mismatch or wear earplugs with ear canal does not reach the designated position， the problem is likely to lead to sound insulation， we offer different sizes of earplugs， suggested to try the three type， small size， small earplugs or adjust the depth of the ear plugs into the ear canal， in wearing comfortable at the same time guarantee the sealing， can well solve the problem of poor sound insulation.