ProdecoTech v4.0 Mariner 8 36V 300W 8 Speed Folding 9Ah Li Ion Electric Bicycle, Pure White Gloss, 20-Inch/One Size Folding Aluminum Frame Front FSG 36V 300W Motor Continental Tires 20"X 1.75" Speed 18mph; Distance per hour 25-35 Miles Twist Throttle Control