Ultra-quiet motor, 2-color mixed charging fan, built-in 1 500mAH14500 lithium battery, distribution of a 0.5m Huawei head IC line, three wind speeds, built-in lithium battery special USB charging circuit, with overcharge and discharge protection, when the battery is charged, the corresponding indicator will always be on, the charging indicator will be off, the charging is safe and reliable, the fan is used slowly for 4 hours, the middle is 3 hours, and the fast is 2 hours.