Power supply: Self-contained battery, also can be powered by USB: Compatible with computers, laptops, portable chargers and other devices with USB output. With base, it can be placed on the desktop. Perfect mini silent fan for office, home, dorm room, study room, library, game room or outdoors. Wind speed: There are 3 wind modes, which can be switched freely through the power button: the is gentle wind, the second gear is natural wind, and the third gear is strong wind Mini Design: Easy to carry and can be easily put into the bag for storage.No matter where you go, it's the perfect companion on those hot summer days, keeping you cool while traveling, waiting in line, or playing sports. The anti-slip handle design is ergonomic, the portable fan is very convenient even for small hands to hold, and the shape of the lollipop makes it an for fashionable girls, boys, men, women and children.