If you are looking for the best personal air purifier that produces negative ions, rather than ozone, this Wearable air purifier necklace is the best choice for you. The air purifier is generated by electrolysis internally and then releases negative ions from the top of the brush. This mini air purifier necklace can form a microscopic health shield. The negative ions produced by OPD air purifiers are effective for pollen, dust, second-hand smoke, and other air impurities. It is simple, compact, and fashionable and can be used in cars, offices, subways, airplanes, bedrooms,s and other places with a complex environments. Let fresh air stay with you forever! Get it now!