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As we all know, the mosquito coils can expel harmful insects. But if it is long time used, it can also be harmful to people themselves, especially some vulnerable populations like children, elders and pregnant women. This strange mosquito coils is made to solve the problem. It can be divided into 9 parts, and each part could be fired for one hour. So you can decide how many hours to use it, and keep the interior atmosphere pure.
China Academy of Art