KRY REAR AVENUE R-30 USB BLACK30 Lumen tail light that can be mounted vertically or horizontally Modes include High Steady, Low Steady, Daylight Pulse, Nitelight Pulse and Economic Flash USB rechargeable no batteries to buy or replace Run time up to 7 hours 30 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