What are the usage methods and precautions for using USB fans?

     USB fans are loved by many people due to their wide adaptability and convenient portability. How to use a USB fan? Let me teach you.
Introduction to USB Fans:
    USB fans, also known as emergency fans or travel fans, can be used in various occasions. Temporary areas without power supply, such as outdoor cooling, vehicle and ship transportation, camping, power outage emergency, temporary operations, mobile stalls, school dormitories, pet cooling during power outages, etc., are convenient to carry and use. In recent years, the development of charging fans has been particularly rapid, and technology has become more mature. More people are paying attention to using charging fans to meet the cooling needs of hot weather anytime and anywhere.
How to use a USB fan:
    The USB fan, hence its name, is a rechargeable fan, but it does not mean that it can only be used by charging. Many products also support plug-in use.
USB fans usually have 1-3 built-in batteries, and in general, it takes several hours to fully charge the battery. The discharge time is between 3-9 hours. This depends on the number and capacity of batteries. The larger the battery capacity, the longer it takes to fully charge, and the longer the discharge time will also be.
When charging, plug in the fan power cord, and the charging circuit can start working. Charge the built-in battery, and after the power is cut off, the fan will be powered by the battery.
    Charging fans have more complex charging circuits, various protection circuits, and batteries than ordinary rotary fans, which are precisely the two most expensive parts of the entire charging fan. This is also why charging fans are more expensive than ordinary fans.
Precautions for using USB fans:
    1. To ensure the service life of the battery, when the lighting of the product becomes significantly dim or the fan rotates significantly slower during use, it indicates that the battery energy is basically used up. Please stop using and charge it in a timely manner.
    2. During the charging process, do not use it to avoid burning out the power supply or internal components of the power supply.
    3. During the use of the product, do not direct eye contact to avoid affecting vision (children should use under adult guidance)
    4. The product cannot be charged for more than 20 hours.
    5. During the rotation of the fan, do not insert fingers or hard objects into the fan blades to prevent the fan from rotating and avoid damaging internal components,
    6. When the lamp cap needs to be folded frequently, it should not be folded continuously at a fast speed to avoid causing plastic friction damage.
    7. If not used for a long time, please charge the product every two months to extend the battery life.