Solutions: 1. When the product's illumination noticeably dims or the rotation speed significantly slides down during use, it indicates that the fan is most out of battery Please stop using it and charge it promptly 2. Do not insert fingers or hard objects into the fan blades during rotation to prevent construction of the fan blades and damage to internal components 3. If not used for a long time, please charge the product once every two months to extend the battery life.