Prodeco V3 Phantom X Speed Folding Electric Bicycle, Matte Black, 26-Inch/One Size SRAM X7 8 Speed Mid Derailleur SRAM X7 Twist 8 Speed Shifter and Avid BB7 Disc Brakes Rear Direct Drive 36V 500 Watt Motor 38.4V 9Ah LiFePO4 24 Cell Battery 20 MPH and 25-30 Mile Distance