Protection Circuit Board DesignCompared with other fans, this fan has a protection circuit board, which can protect the fan's motor from being easily burnt out.High-Quality Polymer BatteryThe use of high-quality polymer battery ensures that 5% electricity of the battery remains before the battery run down, so as to protect the battery and ensure the reusability of the battery. The battery will not generate heat or smoke during the charging process.Lightweight but Strong Wind PowerThe fan has a length of 6.7 inches / 7 cm, a width of 4 inches / 0 cm, a height of 2 inches / 6 cm, a weight of only 0.7 lbs / 79 grams, and a maximum speed of 4980r / min. It is compact and lightweight but has strong wind power.3 Adjustable Wind Speed Levels Low/medium/high speed level. Choose the appropriate speed level according to your needs. The low speed level can last for 5.5 hours, the medium speed can last for 2.2 hours, and the high speed level can last for .5 hours; This small cute fan can be fully charged in 2 hours.Faster Wind SpeedThe speed of our fans is faster than most fans on the market, which can bring you more coolness. With USB charging, you can use it anytime, anywhere, whether you are working, studying or shopping.