DO NOT BUY THEM!  But if you do, try one, keep all the packaging cause you might want to return.
I have no idea what it is supposed to do but it doe NOT do any of the things the description says.  I stupidly purchased 3 and threw away all the packaging thinking these would be great.  I CANNOT BELIEVE I have nothing from the packaging.  It's not like me!!  So, here I am stuck with spending $96 (3 units) and nothing ------ My place is rather small, I had 5 cats, down to 3, litter, humidity, blah blah blah, and it's exactly the way it was BEFORE THE CATS.  BIGGGGGGG DISAPPOINTMENT AND OUT OF MONEY.  :(
Rating: 1 stars