Ravemen Combo Light Ls-Ct01 (Cr500 + Tr20)Feature LR500S Specifically Designed Curved Lens With special optical modeling and design, the curved lens creates an even distributed flood light with suitable beam throw and provides side visibility, great for road cycling and commuting Battery Runtime Extension Extend the runtime of the battery by connecting with external power source for emergency lighting when the light is in low power, no worry to be left in darkness Multiple Brightness Levels