Both fans are not working and the return window is closed. One fan drives almost no air, and the other worked perfectly and suddenly stopped. Now it just comes on and then off again. I have changed BRAND NEW batteries (Duracell) several times and still have these issues with both fans. The odds of getting two lemons make me think they're not worth the money. And I'm staying with them so make sure they work before the return date as I bought them a month before I needed them and now they're going to live in a landfill. Brilliant.