How would a hand held fan work without batteries or electricity?

The handheld fan happens to be small enough to go into a hand bag. But that’s neither here nor there. It has no battery compartment, it’s been in storage for a decade or so. It works perfectly. How?

There are things that work without electricity or batteries. There’s kerosene, light, (artificial or natural) gravity,... But in this fan’s case those don’t apply. So how is it working?