HEPA & Activated Carbon Layer: Captures PM2.5 particles and adsorbs formaldehyde, benzene, and odors through high-density filtration Negative Ion Generator USB Air Purifier with HEPA Filter for car house Smell Formaldehyde Removal Electric air freshener 10 Million Negative Ions/cm³: Neutralizes airborne pollutants, reduces static dust, and mimics natural -like air freshness. Compact & Stylish: Sleek 360° cylindrical design fits seamlessly in car cup holders or on home desks . USB/DC Power Compatibility: Operates via 5V DC or USB adapter, ideal for both car lighter sockets and home outlets.