The cateye tl ld500 rear light is the perfect light for use on rear pannier racks the cateye light features 3 bright leds with a bs approved rear reflector making sure you are seen while on the road the light also comes with a clothing clip so you have the choice to mount the light onto clothing or your bag the cateye tl ld500 rear light features 3 bright leds british standard reflector flashing or constant modes 50 hours in constant mode 100 hours in flashing mode batteries include