This Airvida Wearable Air Purifier is effective at reducing inhalable pollen, bacteria, allergens, viruses and PM25s. This is the smallest and lightest personal air purifier in the world, weighing just 20 grams. Furthermore, the Airvida M1 is also multifunctional air purifier and comes with a detachable titanium necklace, a collar clip and a charging dock that can also be used as desktop air purifier. This innovation enables the effective formulation of 2 million neg­ative ions/cm³ every 0.6 seconds around the user\'s facial area. Since most of the airborne particles are positively charged, these negative ions quickly attach itself to these airborne particles within close proximity, turning them into bigger & heavier particles causing them to fall downwards away from your face. Why do you need an Airvida? Scientifically proven to reduce inhalable pollen, allergens, viruses, bacteria, smoke, PM2.5 and pet dander* 99.7% Coronavirus removal rate* Super light and comfortable to wear. Multifunctional air purifier that comes with a titanium necklace, a collar clip for dresser occasion, and a charging dock that can also be used as a desktop air purifier 28/32 hours long battery life keeps you worry-free for days. No need to replace filters and fans. Complying anti-allergy, low radiation/electronic current, low ozone standards. *Kitasato Research Center for Environmental Science, Japan *National Biotechnology Research Park, Taiwan