Modes include high steady, medium steady, low steady, daylite pulse, nitelite pulse and economic flash Fully USB rechargeable — no batteries to buy or replace Run time up to 11 hours 15 mins Side illumination ports allow cyclist to be seen when riding across traffic lanes 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 Run time in eco mode = 11.15 hours Run time in high flash mode = 2.15 hours