Pushing out over 500 lumens in overdrive mode, the TSL S500 commands your attention on the road or on the darkest mountain trail. The TSL S500 features a unique user replaceable battery. With additional batteries avaliable for purchase, you can charge up an extra, slide it into your jersey pocket, and ride all night long! This lightweight, compact light includes a handlebar mount, USB Charger, and Wall Charger adapter. Youll never have to worry about overcharging either, the built in smart charger protects your battery and eliminates any chance of this happening.Serfas has changed the game on high powered lighting by testing its lights in house with a 20 N.I.S.T traceable standard intergrating sphere. As the name infers, The Serfas True lights promise that you will always get what you pay for.The icing on the cake All Serfas Lights are RoHS compliant. The RoHS directive restricts the use of six hazardous materials in the manufacture of various types of electronic and electrical equipment. Although RoHS is not mandatory in the United States, for over 4 years Serfas has elected to do the right thing for the environment, and only manufacture lights that are RoHS compliant.Standard Model ONLY includes USB cord and Handlebar Mount.