Fast Cooling DownThis personal air cooler can quickly cool down the hot air around you with its Water-cooling System when you stay in front of it (effective working distance: 3-5 ft or 1-1.5 m). For optimal cooling effect, you can add crumbled ice or ice water into the tank and set the unit close to you. Multiple FunctionUpdated Table Fan: More effective with its Water-cooling System than an ordinary table fan.Humidifier and Air purifier: When air goes through the wet filtering curtain, dust particles will be adsorbed and the moist air can be spread with the wind.LED Night Light: The light can illuminate the water tank at night to make you aware of the water level eaisly. And actually, it can be delicate night light itself (Can be turned off separately). Energy Saving & Eco-friendlyBased on its Water-cooling System, this mini evaporative air cooler is freon-free. The power consumption is only from 1.25 W to 3.25 W (depends the fan speed setting). It can be supported by various power supplies which have a standard USB port and provide 5V/2A output, such as USB 3.0 port of computer/Laptop, power adapter, car charger, power bank, external battery, etc.Portable & Easy to UseThis USB air cooler can be easily moved around because of its portable and compact design. You can place it in your kitchen, office or dorm, either on the desktop or by your bedside. Moreover, you could also take it with you outdoors in hot summer days (no built-in battery, external power supply is needed)."