Hmmm .... it plugs into the lighter, it is about the size of a cell phone power corder adapter. An ionizer introduces negatively charged atoms into the air to clear it of pollutants such as dust, smoke, airborne bacteria, odors, and more. Best of all, it plugs into the lighter socket on most car dashboards.
A lot of air cleaning systems use ionizers. It is safe and it gives the car a *fresh*smell, clean really.
Here is one example
Hope this helps,