This cap have a solar panel, which convert the solar energy to electric energy to drive the fan on the cap. The power of the fan will adjust on the sunlight, the more sunlight, the more powerful of the fan.

1. Solar cell is polycrystalline silicon cells cells;
2. Charging Mode: Two-way Charging or solar powered;
3. DC Motor: Operating voltage 1.2V, operating current 55mA.
4. DC Fan: Rotation speed 1850 cycles/min.
5. No batteries required
6. Adjustable headband fits all sizes
7. Lightweight & silent operation