Two-color mixed, 300 ultra-silent motor, charging fan, built-in 1200MAH 18650 lithium battery, distributed with a 0.2-meter USB cable, three-gear wind speed, built-in IC charging circuit dedicated to lithium battery, with over-charge and over-discharge protection, when charging the battery, the corresponding gear indicator will always light on, and the full charging indicator will go out. Charging is safe and reliable. It is used for 4 hours in slow gear, 3.5 hours in mid-range, and 2.5 hours in fast gear.