It emits a subtle airflow (expected with 4W), so it doesn't work miracles. However, with daily continuous use and driving with closed windows, after 10 days, the car no longer smells stuffy (I don't use cabin fragrances or smoke). I was impressed by the quality of the filter (with HEPA layer + activated carbon), as well as the fact that it includes 1 spare in the package! And with such a low airflow, it will take a long time to clog. It also has 3M adhesive (meaning super strong) for attachment to the dashboard (although I have it between the front seats). It has a unique touch "button" that alternates with each touch: simple cleaning/cleaning+UV/OFF. The cable is coiled, so it extends quite a bit. In UV mode, the fan speed decreases because the power is shared between the fan and the UV light.