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when you use the cerumen cleaner to clean your cerumen, It will tell you the most healthy and safe deepth in your ears which the cerumen cleaner can reach.The green mark shows that there is beginning to be harmful to people's health to some extend,and the red mark means the maximum.People should consider where to hold according to their personal situation.So it reminds people of the safe range when they are cleaning the cerumen and avoid hurting the cerumen.