This lightweight HEPA filter rests on a desktop, car dashboard, and even straps to the body to eliminate 98% of germs and allergens. Unlike most bulky HEPA filtration systems, this cordless unit weighs a scant 5 1/2 oz. yet scrubs a 25’ sq. area of dust, smoke, dander, and other airborne particles. With three fan speeds, it cleans indoor air 3X per hour, and can be used outdoors to combat pollen and other irritants. An armband secures the filter around a bicep or child’s stroller handle; the compact device also packs easily for purifying hotel rooms. A companion smartphone app monitors air quality and remaining battery, which recharges via USB to provide up to six hours of continuous use. Filters last up to four months.