This product is useless.It is a box with a blue light that turns on and off. It does not produce that "ion" smell that all other ionizers produce, it did not make my car smell any different even after running it for a week (my car does not need to be turned on for 12v to work), and it makes no sound or any other indication that it is doing anything besides shinning a blue light.I stuck two of these things into both 12v ports in my car, left it for a week and nothing. I stuck my nose to it while on and it smelled no different than when it was off.Do not buy this product.