lead the industry: --Compared with other brands' products, this air purifier necklace has no electric shock and is very safe. This portable air purifier releases over 120 million negative ions to purify your personal space. It is an ionizer and does not produce air transfer like a fan. Work Guidelines: -- The mini air purifier produces negative ions that attach to the particles in the air, making them larger and heavier, accelerating the landing. Form a microscopic health barrier, allowing you to enjoy fresh and clean air at any time Product Features: -- This personal air purifier is effective against pollen, dust, secondhand smoke and more. With a USB charging port, you can use it for 30 hours after 3 hours of charging. No need to replace accessories, easy to carry. Portable and Durable: -- This wearable air purifier is simple and compact, you can hang it around your neck or in your car. Very stylish and can be used in complex environments such as cars, offices, subways, airplanes, etc. Let the fresh air stay with you forever.