Serfas TSL-S250 USB Headlight Standard Edition The industry's most technologically advanced safety lights All lights are robs compliant and all testing is done in house More efficient leds & high quality lenses to increase brightness & Clarity Produces a True 250 Lumens in overdrive mode with burn times up to 15 hours (depending on selected mode) USB rechargeable light, that fully charges in 3.5 hours Includes USB charging cable and handlebar mount Weighs just 150 grams with bracket and uses a replaceable Li-Ion Battery (additional batteries sold separately) Optional: USB Wall charger adapter and helmet mounting bracket (Sold Separately)