Increase volume gradually to avoid sudden increase in sound, adjust volume to the minimum before wearing.
Choose an earplug of slightly bigger size to avoid whistler.
If you hear a howling, check the ear (silica) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage.
Need Battery: AA battery (Without Battery)
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· Super mini size and light weight, not easily to be seen
· 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