This BS approved light set incorporates two of Cat Eyes long standing popular lights in a box set that includes all the brackets and batteries ready to fit to your bike. The Halogen front light provides a bright light with a beam to make you visible to other vehicles as well as providing light on the ground to see by. The Rear AU100 incorporates a reflector into it's design which uses the light from other vehicles to give you greater visibility by bouncing their own light back to them while the led itself can be set to either a constant or flashing mode.