I bought this and then did my research. I know; that was dumb. Let me share what I found out and what led me to return the product. 1) This does not do much to clean the air. Consumer Reports did a study and found out that there is not enough air circulation produced by this gadget to clean the air. Sure, it will grab some of the dust floating around but so will fly paper. 2) This emits ozone and ozone can be dangerous to anyone with lung problems. This unit is made in China. Do you really want to trust that a foreign made product is going to be made so well that ozone levels will not exceed what is healthy? I don't. Sharper Image sells a gazillion of these - but you should check out what consumer reports says before you go for one of these.