This lightweight and durable rear light has max 150 lumens / 57 hour runtime in Flash mode from five ultra high-output LEDs. Features an IPX7 water resistant co-molded design and ten combined lumen and flash output modes including a highly disruptive Daytime Flash mode. USB stick rechargeable with multiple mounting options. Includes a new 800 mAh battery. New mounting style to fit shorter seat posts with USB plug and cable. Wide angle optics with 270° visibility for maximum safety. Rear light is aero seat post compatible.