Aervoe Led Road Flare Rechargeable 16 LED emergency safety flare for use in any vehicle. No batteries required. 50 hours of use on a full charge. Holds a full charge for 90 days. 9 flashing patterns (including S.O.S. Morse Code). Visible up to 1/2 mile. Waterproof to 50 ft., crushproof, and corrosion proof. Meets U.S. DOT, MUTCD and NFPA requirements.