Description: Professional manufacturing, stable performance and high reliability. Thickened copper strips for higher inductance accuracy, smoother motor start and more comfortable ride. Plus, it gives you great hill-climbing power, low motor running noise and eliminated tire noise. Features: The wire and interface are durable to ensure a low failure rate after long-term use. The controller shell is made of aluminum alloy with groove design, which has good heat dissipation characteristics, can protect the internal circuit, and avoid thermal overload.Note: 1. Please choose the correct model before purchasing.2. Due to the demand for accessory upgrades, for Mars' and Cityscape's controller, you may receive one with a 3c interface, which does not affect the bike's work despite the difference in appearance from the original.