There is a solar cell in front of the cap. The solar cell can transfer solar energy directly into electric power which can turn on the fan. Its fanning can change automatically depending on the availability of sunlight.

Wear these caps during the hot summer and you can enjoy a cool,
gentle and agreeable breeze. The solar Fan Cap offers you a
pleasant cool world to accompany you in your summer activities.
The novel design of our solar Fan Caps is fun for kids of all ages.

It's the best promotional gift for big companies or for baseball &
football fans. Customers' logo can be printed or embroideried in the front of the caps, or carved on the shell of the fan motor.