The Do Luck Safety Brake Signal for the early GTR's without DRL's (Daytime Running Lights - LED front bumper lights) converts the rear lights into 4 simultaneous lights.
Next to the better looks it comes with an G-sensor which detects G forces and will make the inner 4 lights flash under severe braking. In case of an emergency, it with therefor make other drivers behind you aware of a dangerous situation in the hope they can manage to brake just as hard and prevent them from crashing into you.
When brake force is below 1G, it will act as normal. When generating over 1G during braking, it will activate the flashing.