This factory can order controllers in large quantities. Will give you the lowest price. The controller and display intelligently identify the voltage, compatible with 36V/48 lithium battery(By setting the "P03" parameter). The controller has a headlight function, long press the "UP" button of the meter to turn on the backlight of the meter, and at the same time the front lights and rear tail lights of the bicycle will be turned on, making it more convenient and safe for you to ride at night.A total of 16 parameters of the display can be customized (there is a manual in the display box), which can be perfectly matched with your motor, PAS, throttle. The S866 Display is easy to install, with clear screen display and powerful functions. Brushless Hub Motor for 250W-500W, Electric Bike, Electric Bike Kit.