The RFR Rack Rear Light Dynamo TOUR's LED tail light with integrated reflector ups the game for safety on the city streets. It complies with German road traffic regulations (StVZO) and is compatible with bikes with hub dynamos. "Standlight" function (stays on when you stop) via built-in capacitor, attaches to 50 or 80 mm spaced mountsLED rear light; StVZO (German road traffic regulation) approved; integrated reflector; standlight function; mounting region either 50 mm or 80 mm; suitable for hub dynamo bikesvoltage: 6Vsize: (LxW) 115 x 45 mmmaterial: plasticweight: 65 g