1.Speed 50km/h, legal power in US market, popular all over the world 2.FOC sine wave dual controller, stable and comfortable riding experience. 3.Brushless gearless design, advantage on speed with long warranty and working life 4.World famous Brand Alex rim, strong and hard. 5.Multifunctional instrument display 6.Update to waterproof system and connector,high quality. 7.electric bike conversion kit 29 48v 1000w