Mini Hearing Aids Invisible Hear Clear for the Elderly Deaf Ear Mini Size Inner Ear Invisible Hearing Aid Volume Adjustable Ear Sound Amplifier

Note:Adjust volume to the minimum before wearing.Choose an earplug of slightly bigger size to avoid whistler.Increase volume gradually to avoid sudden increase in sound.If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage.Keep the ear plug cleanRemove the battery if you don't use it for long time.