Electric bicycle front wheel conversion kit with brushless & gearless hub motor fits for 20' bike Dual mode controller makes motor work under Hall effect and non-Hall effect for extending bike life Pedal assist system for sensing pedal cadence and allowing you to ride electric bike comfortably Aluminum alloy frame for durability and stability, can support a heavy weight up to 220 Lbs Brake levers cut off the power and brake when riding; CE certificated for quality & safety assurance