Wow - IT WORKS!!!!
Thought this was a bit pricey, but not really liking the scented odor maskers, I thought I'd give this a try.  Working from home, my office shares space with two litter boxes, and even though they are cleaned daily, there was always a bit of a smell coming from them - both the litter odor and the used litter odor.  Well, not anymore!  This thing is amazing!  I forget that the boxes are two feet away (it's a small office lol) until one of my 3 cats comes in to do their business.  Even after "fresh business", there is little to no odor.  It does have a bit of a fan noise, but nothing obnoxious.  If you have small spaces with big odors, you NEED this!!
Rating: 5 stars