Sofisundance Portable Mini USB Fan with Two Wind Speed for Home Office Outdoor Blue Cute Fan Whistle Design. Ideal for walking, sports, travel, etc. Placed as a cute decoration on your desk Mini and Light. Portable for indoor and outdoor use. Plus the base can be adjusted to catch the best angle. Two Wind Speed. Push the button first for weak wind and second for strong wind. Rechargeable with USB Charging. Safe and super convenient. Normally it takes about 1.5-2 hours until its fully charged. Two Hours Working Time. Please note it has to be turned off when charging. The battery lifespan may be affected if its charged with no power at all.