Review on Stay Cool Anywhere: O2 Cool 5 Inch Battery Operated Portable Clip Fan (2 pack) - Grey by Christina Jones

I bought these for my twin grandson's stroller, one for each size. They push a lot of air to be so small. The fan runs on D batteries, I don't know how long they will last. We've used them several times and don't see any signs of slowing down. The fan can be rotated almost as far as it will go. The clamp is really impressive. It's pretty springy. Clamps very well. I would definitely recommend this fan to anyone who needs a portable cooling source.