1. Charging: Hat+fan (rechargeable), directly using battery power supply. It can work for 4-8 hours with a full charge. 

2. Solar energy: Hat+fan (rechargeable+solar energy power supply), flip the switch to directly switch between battery power supply or solar energy power supply, battery power supply can be used when there is no sunlight. The battery can work for 4-8 hours with a full charge (6-8 hours in the first gear, 5-6 hours in the second gear and 4-5 hours in the third gear); When the sun shines, it can be switched to solar power supply mode, and the working time will be longer; The solar panel only supplies power to the fan, but can't replenish the battery. 

3. Single and double fans can be provided, and colors can be freely selected and customized. The surface of the hat is waterproof coating, and it is equipped with breathable mesh and elastic band. 

4. Brim size: 12cm, hat depth: 10cm, and hat circumference: 56~60cm.