USB rechargeable 500 lumen headlight and 45 lumen tail light combo pack. Headlight has 6 modes , High steady, Medium steady, Low steady, Daylight pulse, Nitelight pulse and Economic Flash. Tail light has 5 modes , High 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%, Green = fully charged.