This air cooler has upgraded power supply. 4 in 1 Multifunction: Our portable air Cooler combines cooling, humidifying and purifying air functions and 7 colors smoothing night light, providing you with cool and refreshing air. Easy to operate, you can fill cold water with an ice cube for mist humidify cooling air. Features: A useful Air Purification machine A Personal Space Cooling Fans A small air humidifier A sleeping partner with LED night lights For Office For Sleep Specification: Size: 14.5 * 16 * 17 CM You can simply fill the tank with water, ice cubes or essential oil, Plug it into a USB port or other standard wall outlet, and turn it on. Adjust the wind speed according to your specific situation (one-key adjustment of wind speed in high, middle and low three gears)