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"Free Black" is designed mainly for passive smokers, and "second-hand smoke" is no less harmful than active smokers, especially for young children and women. "Free Black" USES the intelligent recognition system, smoke scanning combined with "aerodynamics"principle and annular lot collocation, more comprehensive and effective absorption of second-hand smoke, for multiple filtering, deep purification of second-hand smoke. This greatly reduces the harm caused by second-hand smoke to passive smokers.