Effective even for large area but noisy
The white noise is really loud. The noise is around 800Hz and 60-70dB right beside it.<br /><br />However, it works pretty well with reducing ordor. I have two teacup poodles. They pee and poop on the pee pad. If I woke up late or came back home later than usual, their poops will stay on their pee pads for hours. Now, I can barely smell their poop. The area that this tiny thing works on is ~700 sq ft.<br /><br />5 stars for reducing ordor. -1 star for the white noise.
Rating: 4 stars