Black/red Anion Car Charger with Air Purifier(with Dual USB Output)(3.1A) Max Output Current: 3.1A Input Voltage Range: 12V-24V Anion Output Density: 6,000,000 / cm Generates anion (negative ion) which purifies the air within the car, keeping it fresh and clean. Inhibits bacterial growth by eliminating smoke/pet odors and detoxifies the air of harmful pollutions.