... confusion and malfunctions. 2,Material and Color J—LCD products are made of black PC material. ... . 3,Function Summary and Button Definition J—LCD user settings include local time setting, top ... Km),wheel size setting(18—28inch),LCD backlight brightness setting. J—LCD displays battery capacity, time, motor ... MPH and Km/H. The range unit is changing accordingly with the speed unit. Wheel Diameter ...