The new Supernova E3 Tail Light 2 expands technical limits while embracing Supenovas' design ideals. The electronics for the rear light are neatly integrated into the front light thus allowing for the extremely small design of the light. The CNC machined rear light is very elegant and weights in at only 12 grams. It is also 100% water proof which is a real bonus. Designed in Germany it is one of the brightest rear lights that is compliant with the exacting German road traffic act. The light is designed to wire directly into your front Supernova light so it needs no batteries of its own.