Bell: By positioning it high on the helmet, the Blackburn light is readily visible over a backpack. The GRID has 4 settings and gets up to 15 hours of runtime. The light is also removable with the click of a button. The Grid Rear Light has four mode options so you can choose if you need high lumen power or extended run time. Ready for those commuting in the city, riding the open roads, or heading to their local trail. Grid Rear Lights offer plenty of rechargeable power to keep you visible while out riding.