Description Advanced Manufacturing, Unmatched Reliability. Reinforced Copper Strips for Precision and Smooth Ride. Superior Hill-Climbing, Quiet Operation, Tire Noise Eliminated. Features High Performance - Strong starting, high climbing power, low motor noise High Security - This electric wheel speed controller has higher safety performance and longer service life Perfect Replacement - It will perfectly replace the old or damaged Compatibility: For Pony Step-Thru Electric Bike. Please check your frame number before ordering.