RECHARGEABLE BATTERY OPERATED FAN- With the 2500mAh Rechargeable lithium-ion battery, thesmall fanis extremely portable as no cable wiring needed which can be used both indoors and outdoors. Recharges with the provided USB charging cable. Works time for 3-13 hours on a full charge. 4 ADJUSTABLE SPEED LEVEL- Thismini fanhave 4 speed level(Low/medium/high/sleep mode)can adjustby pressing the power button repeatedly. The sleep mode can avoid headaches, stuffy nose caused by prolonged strong wind and meet the physiological needs of people.And 4pcs fan blades, strong wind, wind distance up to 3m. Brushless motor makes the fan durable. REMOVABLE BASE- With the removable base, You can use it in your office or carry it around to solve the hot stuff on the road. Meet your cool needs throughout the day. Meanwhile, the fan base can also be used as a mobile phone holder for video watching. MULTIPLE CHARGING WAYS -With a wide range of USB interfaces, you can use the USB charging cable link to computers, power bank , laptops and other devices to enjoy cool wind no matter where you go. PORTABLE LIGHTWEIGHT DESIGN -This portable fanis only 165g. When you go outside, you can put it in the bag and take it to anywhere, especially suitable for summer travel or outdoor sports.