Serfas True 500 Lumen Headlight Produces a True 500 Lumens in overdrive mode with burn times up to 11 hours (depending on selected mode) USB rechargeable light, that fully charges in 3.5 hours New, updated plus (+) battery provides 22% longer burn times Includes: USB Wall Adapter for charging and Handlebar and Helmet Mounting bracket Weighs just 150 grams with bracket and uses a replaceable Li-Ion Battery (additional batteries sold separately)