Supernova E3 2 Taillight: Seatpost Mount, AC Current, BlackAt only 18g the E3 Tail Light is the lightest tail light in the world. Combining this with an exquisitely crafted CNC aluminum body, 100% waterproof casing, multiple mounting positions and adaptors, and three supremely bright LEDs, the E3 Tail Light is unrivaled in its sleek simplicity and impressive functionality. The E3 also comes equipped with a stand light that remains illuminated when stopped so you're still safe when waiting at a red light. The