Serfas LED USB Rechargeable Light, White/Red The industry's most technologically advanced safety lights All lights are robs compliant and all testing is done in house More efficient leds & high quality lenses to increase brightness & Clarity Has both White and Red LEDs for use as a headlight or taillight USB Rechargeable Charge indicator light Easy to use, integrated mounting strap Run time: Up to 10 hours on low flash mode