Evaporative Cooling Technology: Portable Air Cooler draws in warm air, quickly cools it with water evaporative cooling, provides humidified and cool air for your personal space, outlet design adjustable multi-directional airflow, if you add ice water, it will be effective. Cools the hot air around you. 3-block wind speed adjustment: 4-in-1 multifunctional design, not only a nice air cooler, but also a mini fan, humidifier, LED decorative lights, circulating colorful mood lights can easily find it at night, the cooling effect is remarkable, which can help you sleep better. Portable and Quiet: This mini fan air conditioner is designed to be lightweight and does not take up space, it can be easily carried, suitable for home, office, outdoor picnics, camping, etc. It is very quiet (40db), even if you read in the library, you don't have to worry about the sound disturbing you and the people next to you. Economy Energy Saving & A+++ Energy Saving: Contains no harmful refrigerants and doesn't use a compressor like traditional power-hungry air conditioners, this small air cooler works for you with a 3W power rating, which is very energy efficient compared to window air. power conditioners while protecting your family's health. Built-in 3600mAh lithium battery: The battery has a long service life, which is different from the traditional cooling fan plugging method . When using the USB cable to fully charge this water cooling fan, the 3600mAh water tank capacity can power supply for a whole day (24H).