Signal Dynamics Back Off Brake Light Signal Module - --/-- This compact, solid state electronic module converts your ordinary brake light into an attention-getting, visual-alerting device Module causes 3 short flashes, stays on for 3.5 seconds, then repeats the cycle for as long as the brakes are applied 12V DC, max. capacity 10A, sealed weather resistant heat sink case, 2-14"L x 58"H x 1-58" W