The Reflex Auto will automatically turn on whenever both darkness and motion are detected by the motion and light optic sensors, providing the rider safety both while the light is turned on and while functioning solely as a reflector.Key Features:5 LEDsGreater than 180 degree visibilityAutomatically turns on / off by light and motion sensorsEmits light for 50 seconds after the bike stopsBuilt-in reflectors that meets highest government standards (USA, Great Britain, Europe and Japan)OptiCubelens technologyAAA alkaline battery x 25 modesMode memory functionSP-5 bracket (ø21.5-31.8mm) and Rear rack bracketWeight 82gDesigned in JapanRuntime:Constant mode30hrsFlashing mode100hrsRapid mode60hrsLong-life mode120hrsPulse mode30hrsTechnologies:Auto Light: Auto on/off controlled by motion & optical light sensors to automatically turn the light on when darkness of motion is detected.Reflector: Our reflector technology exceed the highest government standards around the world.Opticube: Our