Unique structure. fashionableSmall and exquisite. easy to carryBall fan. wind strong and durableDigital control. simple operationMachine welding. stable and reliableBattery is removable. easy to replaceUSB connector. easy to chargerHigh efficiency and low loss. Energy-saving and environmental protection.Output air volume: 1-Speed 873 L/Min (work time about 2 hours)2-Speed 459 L/Min (work time about 4 hours)3-Speed 242 L/Min (work time about 7 hours)Output power: 4 W (Max)Battery: 18650 Lithium-ion batteryCharger: Input: 100-240V ACOutput: 5V 1A DCCharging time: about 5 hoursProduct Weight:150gDimension:20*11*5cmWeight:200g