Viking Nature Car Air Purifier / Car Ionizer / Mini Auto Car Gadget Pure Air Odor Cleaner & Smoke Remover (grey) This air purifier ionizer releases 4.8 million negative ions per cm in your car for massive odor-fighting power. Which is considered vitamins for the air; helps increase concentration and relieve car sickness Keeps the cars internal environment healthy by removing smoke, odors, pollen, air pollution and more Kills 99 percent of harmful viruses and bacteria; known in many cases to benefit sufferers of allergic sinusitis, asthma, and chronic respiratory tract allergies Proven benefits include decreased respiratory rate, can lower blood pressure, produces a feeling of well being, decreases skin temperature Easy to use just plug it into your car cigarette lighter or 12 volt outlet; a blue led light will turn on when working; no filters to change