Product review (1 stars): Tried by an electronics tech..DO NOT BUY!
I saw the reviews, both good and bad, so I decided to try it.  I am an electronics tech, so I DO know how to put in batteries!
VERY difficult to get batteries into it. Once you do the cover won't fit.
Batteries DID get hot within one minute, a battery was already heating with the unit off. Not a safe situation.
 Fan does run, I am going to rewire the unit with a new switch. All i needed was the fan and the case..ill do the rest.
 A VERY POOR PRODUCT I would never recommend for anyone. I have seen the same unit with many different company logos on it price ranging from $9.00 to $30.00 !
 DO NOT BUY IT if you don't want to modify it to work.