For the $28 one can't say much about the looks, its a very
simple design with a wire and plug to your car's cigrette lighter.
The $48 as advertise looks cool with a "ergonomic" stand, thats
what they claimed, looks like some kind of spaceage sensor. The
cheaper model has 6 stainless steel points to generate the -ve ions
wherelese the other has only two. The effectiveness is of course
obvious. BUT the latter has battery compartment that you can use it
for portability, and it is easier to clean and maintain, I guess
this is what you are paying extra for it.
The one i bought for the room is $98, is very good, removes the
odour.
