Review on CTpepper Plug-in Air Purifier - Negative Ion Generator for Home | Mini Ionizer to Eliminate Smoke, Pet, and Toilet Odors | Portable for Bedroom, Kitchen, Office | 2pcs Purple by Bianca Mares

Seems to work, but hard to tell. All I know is that the smell of the litter box doesn't bother me anymore. I suppose I should turn it off and see if there's a difference, but I'm happy. I've had it since I've been working from home, my desk isn't too far from the guest bathroom where my two cats have trays. I used to wince walking down this corridor, now I don't even notice it. Victory. I like it. I ordered 2 first and then ordered 2 more for other rooms. It was great, my husband stopped sneezing every morning and his runny nose went away too. It worked