This product came and i mean you can see the difference with my son sleeping with it on over night. Woke up refreshed and bright as a bulb. The fan has a few different speeds and a L.E.D green light that looks pretty cool. You have the choice of keeping it on or turning it off. There is also a sleep mode that puts the fan in a quiet motion but still filtering the room quietly. Very easy set up. Filter replacement is also a breeze.