A. Evaporative Cooling Technology: The portable air cooler draws in hot air, quickly cools it down through water evaporation, providing humidified and cool air to your personal space. It has an adjustable multi - directional air outlet design. After adding ice water, it can effectively cool the hot air around you. B. 3 - block wind speed adjustment: It has a 4 - in - 1 multi - functional design. Not only is it a cute air cooler, but also a mini fan, humidifier, and LED decorative lights with colorful circulating atmosphere lights, which are easy to find at night. It has a good cooling effect and can help you sleep. C. Portable and quiet: This mini air conditioner fan is lightweight and does not take up space. It is easy to carry and suitable for home, office, outdoor picnics, camping, etc. It is very quiet (≤40db), so even if you are reading in the library, you don't need to worry about the sound disturbing you and the people around you. D. Built - in 3600mAh lithium battery: The battery has a long service life, different from the traditional method of connecting the cooling fan to the power supply. When you fully charge this water - cooled fan with a USB cable, the 3600mAh water tank can provide power for about a day (24 hours).