The American Red Cross Emergency Light key helps keep you safe in the event of a roadside incident, by alerting other vehicles to your presence. These emergency lights are safe and easy to use and because they are battery powered, they are reusable. You can use either a steady beam or flashing pattern to alert other drivers and law enforcement officials. The bright LED lights can be attached to your car with the built-in magnets or use the built in brace to stand the unit on the ground, car hood or trunk. Each light measures 6 and one quarter inches by 4 inches. PLEASE NOTE: There is some incorrect printing on the front of the packaging. The packaging states the "kit contains 2 battery powered emergency lights and 8 AA batteries...". The batteries are not included and must be purchased separately.