Description: The Wearable Air Purifier has a built-in smart chip to decompose large particles through electrolysis, such as pollen, dust, second-hand smoke, and PM2.5, etc. Besides, it has 2 adjustable levels for the negative oxygen ion concentration. The high-gear is about 120 million Pcs/cm3 and the low-gear is about 80 million Pcs/cm3. It is convenient to wear with the lanyard along with the package. It is small and lightweight for children, students, the elderly, and office workers to wear in complex environments, such as cars, offices, subways, airplanes, and bedrooms, etc. It is a practical and convenient device. Specification: Name: Air Purifier Necklace / Wearable Air Purifier / Portable Air Purifier / Ionizer Air Purifier Color: Black, White Size: About 80*35*23mm / 3.15*1.38*0.91inches Voltage: DC 5V Power: Le than 1W Current: Le than 50mA Battery Capacity: 700mAh Negative Ion Concentration: 80million-120 million/cm3 Charging Interface: Type-C Net Weight: About 48g Packing List: 1*Air Purifier Necklace 1*Charging Cable 1*Manual Notes: 1. Due to the lighting effects and shooting angles, there is a color difference in the product, please understand. 2. Due to manual measurement, there is a tolerance in the product size.