Under precondition of Precooling, energy will directly push into skin deep, epidermal.
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It goes through cooler and enters Precooling unit to be cooled to 5~10℃.
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Then it goes into air Precooling system, where air is cooled to 17.
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Under precondition of Precooling, energy will directly push into skin deep,
epidermal pigmentation cannot inhail energy, so it can safely act on pigmented skin.