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Specification: charging voltage:5V DC static current:≤3mA operation current:≤30mA mainframe size: 2.87*1.81*1.1 IN HiKiNS personal air purifier description: This portable air purifier adopts advanced negative ion technology.It can continuously release healthy negative ion air flow through the portable air purifier.It produces 3 million anions / cm3, allowing you to breathe clean air wherever you go. What's the negative ion? Negative ions are negatively charged oxygen ions in the air. In the medical field, negative ions are recognized as effective means to clean the air. Medical research shows that the negative charged particles in the air increase the oxygen content in the blood, promote human metabolism and improve human immunity. Therefore, negative ions are called "air vitamins".