This FlareAlert beacon is especially useful when workers are unable to use flames or other potentially hazardous light sources. This red LED flare is weather resistant and has the ability to withstand the weight of a 20,000 lb. vehicle. A built-in magnetic base sticks to vehicles or metal objects for increased visibility. The 4 rubber feet on its base prevent scratching and slipping. Comes with two lighting modes, Flash and Steady. Flash mode runs 60 hours, and Steady mode runs 20 hours. Batteries are easy to change due to its quick release feature. Requires 4 AA alkaline batteries (81937, not included).