KRY FRONT ALLEY F-800 USB BLACKUSB rechargeable 800 lumen headlight 6 modes per light, High steady, Medium steady, Low steady, Daylight pulse, Nitelight pulse and Economic Flash Memory Function Light turns on at the last mode it was turned off Power saving function 10% power or less, lights will automatically switch to lowest lumen output Built in battery indicator Red illumination = lower than 25%, Yellow = 50% 25%, Green = fully charged Side illumination ports allow cyclist to be