A. 【Dual Power Supply】 USB desk fan with built - in 2000mAh battery is convenient for outdoor use; rechargeable fan works for 4 - 16h. In addition, the plug - and - play office electric fan USB can be adapted to power bank, laptop, car adapter, etc. The small fan shows red light when charging, and green light when fully charged. It can be fully charged in 3.5H (you can use the desk fan while charging). B. 【3 - speed strong airflow】The desk fan can be easily adjusted by pressing the button; Speed1 - Blue Light: gentle wind, pleasant like spring breeze (2.2m/s - 1600rpm), which is good for indoor air circulation; Speed2 - Green Light: cool wind like being in a forest oxygen bar in the early summer morning (3.2m/s - 2200rpm); Speed3 - Red Light: Strong wind blows away the summer heat (4.0 m/s - 2600 rpm). Cute battery fan is suitable for various occasions. C. 【Quiet USB Fan, Powerful】The blades of the mini silent fan are made of good materials, so the sound of the silent fan is quieter than other ordinary airflow fans. The minimum sound of the small desk fan is about 30 dB, and the maximum is no more than 50 dB, which is suitable for work, study and leisure. D. 【180° Adjustable Fan】This electric desk fan base can rotate 180° so that you can adjust a comfortable angle. The beautiful appearance design is like a small work of art, which not only provides coolness, but also decorates your desktop. E. 【Portable & Easy to Clean】The compact handheld fan is small in size (14.5*3*18.5cm) and lightweight (255g), making it easy to carry and store without taking up too much space. The wireless personal fan is suitable for office, library, bedroom, school, car, even travel and other places to keep you cool in summer. In addition, the easy - to - disassemble design of the USB desk fan is convenient to clean the dust on it at any time.