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It is a kind of smell jewelry protect womankind from sexual harassment.The soft plastic necklace is filled with sodium sulfide power and oxalic acid liquid.A collision or squeeze can causes the oxalic acid bag to break,then the oxalic acid reacts with sodium sulfide,producing awful hydrogen sulfide gas.The bad who smell it will suffer from nausea，tears，and vomiting.That's how it attack thecriminal by releasing awful smell.