Portable Hepa Air Purifier is a 3 in one product ( Negative Ion Generator, Portable Aroma Diffuser, Portable Hepa Filter). Many people suffer from allergies because of polluted air. Wearable purifier is a perfect product to carry with wherever you go. It purifies the air you breath and destroys the bacteria and viruses. It has been tested and proven effective. Wearable air purifier is so lightweight.