Erlectrical parameter pertormance aboratory test data Number of working gears: Extreme speed regulation input power: 5V3A 9V3A 12V3A 15V3A 20V2.25A output power: 5V3A 9V3A 12V3A 15V3A 20V2.25A Charging power: ≧45W Charging time: About 3H Battery capacity: 5000mA*2 37wh Motor diameter: 40mm Maximum speed: 80000r/min Minimum endurance: ≥30min(90000r/min) Maximum wind speed: 39.5m/s LED power: 1.5W/2.0W/3.5W Operating temperature: 0℃~45℃