I think 2 things of buying these, Why did I do it? and thank God I did. These in UV setting show absolutely every bit of fluff, dust and pet urine, as I found out when I shined it on my rather expensive rug and it lit up like Blackpool tower! My small dog had decided to make the rug her potty on the sneak, she was climbing under the coffee table and weeing whenever I wasn't around by the looks, I knew I could smell it but couldn't for the life of me find it hence why these were purchased, this helped me do that and the rug has been binned and replaced, smell gone, dog not allowed in living room while out.
I also like that they switch from UV to white light which means I can also use them for walking the dogs meaning one torch does it all no need to have loads clogging up the hangers where I keep them.
My house has never been so clean and I'm a bit of a clean freak anyway, there was dust and fluff in places I didn't even realise dust and fluff could go!
I am very happy, dogs not but hey I like to think I'm the Alpha (when I'm really not, she runs hoops around me lol).
Would definitely recommend this product unless you don't want to feel like you've been cleaning all wrong all your life! You won't regret buying this until your tired from all the cleaning! More than happy with my purchase..