Defective units
2 out the 4 I ordered didn't work at all.  Had to get Amazon involved because shipper said it wasn't their fault, and that I had to contact the manufacturer. What???  Finally Amazon (who is always great) got me a refund on the 2 defective containers.  Too bad, because this is the best air freshner I've used.  Hangs in the air longer than others and doesn't get sticky on stone floors.
Rating: 1 stars