im thinkin of gettin one as well...looks like this

here are the specs:
Simply plug it into the cigarette lighter plug, and all you need is
10 seconds to feel the difference.
Get rid off the pizza/burger/kfc smell, coffee spills, whatever
food you ate in the car before.
No More Noise/Ordor
* Simply plug into cigarette lighter
* Generates millions of Negative Ions
* Uses no chemical or agents
* Maintenance Free
* Refresh air in cars
* Working Voltage: DC 12V
* Power Consumption: 0.6W
* Weight: 30g
* Size: 8.4cm(L) x 2.5cm(Dia)
* Negative Ion Concentration: 43,000 ions per cube inch
Negative Ion: Negative ions can clump microscopic particles
together and make the floating particles fall to the floor.
Negative electrons can clean up the air, activate oxygen and help
human health to make people feel better.
Ozone(O3): O3 purifies air through oxidation. When it occurs, both
the atom and contaminant are destroyed. Contaminant therefore
changes into carbon dioxide and hydrogen that make the air
clear.