I thought that I would try this because it was new and on sale. The regular price on it was way too expensive for me... For some reason I tie expensive with good quality. Any ways I really wanted to try this to get the smell of dog out of my house. It is a smaller plastic white, almost coned shaped device that give a burst of fresh scent every so often. I has 3 controls l,ll,and max. I set it on 2 or ll. I put this into my living room and rarely smell the thing. when I walk by it and it has just sprayed or when I am sitting in the room close by I can notice it. I do not think that it works well for large rooms. On the other hand I also put one in my bedroom with the lavender scent. my bedroom is quite a bit smaller than my living room and with the door close the smell really lingers. I do enjoy the calming sensation of the lavender. I would recommend this product for small rooms only. the other thing about this is that you have to buy the refills and if I remember right they were around 5 bucks each, my opinion is for that price it is not worth it.