OPOLAR Battery Operated USB Rechargeable Fan, Portable Personal Handheld Fan, 3-13 Running Time, 3 Speeds, Enhanced Wind with Internal and Side Light, Quiet Desk Fan for Boating,Travel,Camping,-4 inch ENHANCED AIR WIND-Thanks to OPOLAR's latest dynamic technology, the maximal fan rotating speed arrives to 3200 rpm. More airflow, but less noise. 3-13 WORKING HOURS AND ADJUSTABLE 3 SPEEDS - 2200 mAh Improved battery(type-18650) makes 3-13 hours after a full charge. The portable fan speed can be adjusted among low, medium, high according to your demands. PORTABLE AND COMPACT-Small (3.94x1.58X5.9 inch) and exquisite, easily put into a bag inside. Weight (7.8 ounces), Perfect for outdoor activities and travel, or just place it on the desktop. USB OR BATTERY OPERATED- Upgraded 2200 mAh rechargeable battery (included) or by being connected with a USB cable (included) even use an adapter(not included) to plug into wall socket. SIDE AND INTERNAL LED LIGHT, ONE YEAR WARRANTY- Side and internal light would be a big bonus for lighting. OPOLAR offers one year warranty against defects. Please be assured that we stand behind our product always.