1Fully Configured: The bike modification set includes 15A controller, S866 panel, quick release dial, power assist sensor, and controller storage bag. It can be used alone or in combination, you can DIY according to your own situation. 2Aluminum Alloy Housing: The controller housing adopts aluminum alloy material,with excellent heat dissipation performance and durable wiring. 3Multiple Data Displaying: The panel can display speed, power assisted gear, power, fault prompt, total mileage, single mileage, single riding time, etc., which is convenient and helps you keep abreast of riding dynamics. 4LCD S866 Panel: The S866 panel shell is made of ABS material and supports backlight brightness adjustment; buttons are operated quickly, the interface is clear, and it is easy to use. 5Application: The controller is suitable for 36V 48V 250W motors. The LCD panel and dial are suitable for 22.2mm handlebars, and the panel match the No. 2 communication protocol. Easy to install and use.