TechIntheBox LED display Portable Fan 4-inch 3 Speeds Mini USB Rechargeable Fan with LED Light Powered By Electric-powered or 18650 Lithium Rechargeable Battery Micro USB Cable Via USB Port of Notebook/ Computer, Cool Fan for Desktop Indoor and Outdoor Activities As Camping/Boating/Climbing/Biking/Hiking/Travel and/Picnic/Hot Summer Outdoor Travelling ETC (Yellow) LED display Intelligent portable fan lithium-ion rechargeable battery, convenient to carry anywhere and anytime. 15000 Hours lifetime, 100% pure copper brushless motor,3200RPM/min (other USB fan is below 2150RPM/min),high energy conservation, Environmental protection. removable 2600mAh 18650 rechargeable lithium ion battery included Brand new LED display intelligent charging,High efficient and 2-8 Hours long working time (Depend on the mode you use).Two-in-one design, used outdoors powered by battery and indoors by USB It will give you the breeze you need to stay cool practically silent. The fan palm-sized, making it easy to take with you on the go. Get the cool you want no matter where you are. The THREE different speeds allow you to choose how much air is being moved to achieve your maximum level of comfort. It can provide up to 8 hours of cooling power after fully charged which makes a smart addition to a desk at work or at home or outside.