Fomei Fomei-jk99 Rechargeable Portable Handheld Mini Foldable Operated Cooling Fan Electric Personal Fanswith 18650 Battery for Home and Travel(handfan, Black 1) Battery: 18650 Li-ion battery 3.7V / 2000mAh Perfect fan for the office, home, dorm, study, library, games room Rechargeable and replaceable 2000MA 18650 Li-ion battery, can be charged by USB charger, computer, power bank Product Size:0.36"*0.33"*0.21", Color Box Size:0.37"* 0.35" * 0.22",Net Weight: 166G Material: ABS , Flabellum: 6 pieces / 4 inches