ToolUSA Road Genie Highway Safety Steady / Flashing Light With Magnetic Back - 18 Red Led Light: FL-33250,ToolUSA" /> Carry One Of These In Your Truck, Car, Boat, Or R.V. Red light is visable up to a distance of 2000 meters. Requires 4-"AA" batteries (not included), which will last up to 24 hours of constant use Has a stand on the back, so it can be placed in the roadway Light has 2 functions: steady or flashing