1, LED display, hanging neck/handheld/desktop,2, 5 speed wind adjustment, 90 ° adjustable,3, Dual batteries for long battery life, can support mobile phones. SpecificationMaterial: ABS+PP+electronic componentsSingle net weight: 175gProduct size: 18.8*9*4.65cm/7.4*3.54*1.83inInput voltage: DC5VBattery capacity: 1800mABattery voltage: 3.7VUse time: about 3.5-7 hours