arrow sign board led 1)Energy saving 2)Can adjust the brightness 3)2 years warranty 4) Wide work voltage arrow sign board led : 1, LED lamps with patented mirror technology2, Visibility up to 1 mile3, Visual indication of arrow modes on controller4, Low vehicle battery and short circuit condition5, Auto up/down motor function6, 12 arrow modes7, 5 flashing modes, 7 sequential modes8, View distance ...