Latwne S830 24V 36V 48V LCD Display Screen for Electric Bicycle Ebike Meter Panel Universal with USB Cycling Parts,WaterproofOperation :Long press the up and down buttons of the instrument to enter the instrument settings.P01:Backlight brightness,level 1 is the darkest,level 3 is the brightest.P02:Mileage unit,0: KM;1: MILE.P03:Voltage level: 24V,3..