Extremely powerful and versatile LED taillight; Light and durable co-molded lens/body construction; Waterproof; Unique aero and round post compatible design; Five market-leading, ultrahigh-output LEDs delivering up to 300 lumens; Mode Memory function returns to selected mode after turning off; Nine combined lumen and flash modes, including the extremely visible 300-lumen Daytime Flash mode; Enhanced lens with built-in side visibility; Integrated cable-free recharging USB stick