USB Powered: The evaporative cooler comes with a usb cable that compatible with computer, power bank, wall chargers and any other USB-enabled power supply. Just plug it into the power supply for the whole day or night working. Perfect for your bedroom, , living room and kitchen. Powerful Cooler: Do you feel dry when in a room with -conditioned on? Portable Air conditioner helps you! Enjoy a cool summer with this fan. Saving & High Efficiency: This small conditioner has lower consumption that is cost effective. The fan can be automatically set to from side to side, allowing it to blow in more directions. Use time: fan: about 12 hours; second gear about 6.5 hours; third gear about 3.5 hours. speed and easy to use: We've improved this portable Air conditioner to set up and use. The three-step operation cools the hot around you in seconds, making the wind cooler, wetter, and cleaner. This portable Air conditioner fan can make a thoughtful gift for friend or family who needs a comfortable and cool relaxing environment in the summer.