Aervoe Industries 1144 Economy LED Road Flare Kit, Yellow (Pack of 6) Rechargeable design means no batteries to replace. 16 Yellow LEDs per Flare Flare is solid polycarbonate plastic with impact resistant rubber housing LED visible over 4 miles, light pattern visible up to 1 mile. Waterproof to a depth of 50 feet Internal rechargeable lithium ion battery 850 mAH - 3.7v, 5+ year life 9 different flash patterns includes SOS and Rescue Morse Code