The cateye el120tl170 light set consists of the cateye el120 front light and cateye tl170 rear light the front is perfect as a budget commuter or as a back up it has a single led and uses opticube technology incredibly affordable this is a quality bike light set that represents fantastic value with constant or flashing modes simple and easy fitting great battery life and compact lightweight design you need look no further cateye el120tl170 light set features includes batteries