Cygolite Dice Duo 2-in-1 Headlight/TaillightThe Cygolite Dice Duo 2-in-1 Headlight/Taillight Combo is an all in one light set. A single 110 lumen that with the press of a button, can change into a bright 60 lumen taillight. With 8 different light modes, as well as a day/night sensor. The charge time is only 2 hours, and can last up to 40. Water resistant and daylight visible, weighs just 30 grams.745025075083