Portable Cute Bear Air Purifier Necklace PM2.5 Anion Air Freshener Low Noise for Cleaning Germs Dust Viruses Bacteria Feature: The pulse tip technology is used to release a large amount of oxygen anion. Release a large amount of oxygen anion, kill harmful bacteria, mold and virus, decompose smoke, odor and formaldehyde, benzene and other harmful gases released by car parts. Negative ions promote metabolism, activate cells, refresh and relieve motion sickness. Mini,portable necklace design, stylish and convenient to carry. Easy to operate, 1 button for on/off.Just press the button for two seconds to enjoy the for fresh air. Specification: Filter type: composite filter Power Supply:USB Noise: 30 db Working principle: anion Applicable area: less than 10 Product category: air purifier Control mode: mechanical Rated frequency :50HZ Function: remove formaldehyde Color: square [gray], square [white], bear [blue], bear [pink] Air volume of air purifier :50 m / h Quantity:1Pc. Note: The light socket and the different screens can cause the color of the item in the for image to be a little different from the actual one. The allowed measurement error is +/- 1-3 for cm. Product includes: 1Pc Air Purifier, 1Pc charging cable, 1Pc user manual