These 28" Pack and Pop cones meet MUTCD Standards; they are constructed of orange waterproof nylon and collapse flat for easy storage. These Pack and Pop Cones have 1 L.E.D. internal cone light-bulb. They operate on 2 'AAA' batteries (included). The internal light has two settings: steady burn and flashing. The cone light endures 100,000 flashes or 36 hours of steady burn.