Axiom Ultra Spark LED Tail Light Ultra bright 15 chip COB LED projects 8-25 lumens of light Side visibility ports increase safety in traffic 6 light modes: Low, High, Over Drive, 50% Flashing, 100% Flashing, Strobe Runtimes: up to 5 hours 20 minutes Low (8 lumens); up to 3 hours High (15 lumens); up to 1 hour 30 minutes Over drive (25 lumens); up to 6 hours 50% Flashing; up to 2 hours 40 minutes 100% Flashing; up to 4 hours 20 minutes Strobe Built-in lithium polymer battery charges in only 2 hours via USB port