Signal Dynamics BackOFF Wig Wag Brake Light Modulator Features: Compact, solid-state module converts your ordinary brake lights into your choice of attention-getting visual alerting signals First, emits 4 alternating quick flashes of left and right brake lights followed by a long flash of both lights The second emits a visual signal of 4 alternating quick flashes of the left and right followed by 3 short flashes of both brake lights Draws 10-amps maximum and simply splices into the brake light wires