150 lumen flash output. Run time 2 to 210h. Micro USB rechargeable. OSP technology lets you maximize your visibility by adjusting the flash speed or brightness. 6 lighting modes Steady Zoom Triple Flash Single Flash Random SteadyPulse SteadyPulse mode alerts motorists with attention-grabbing pulses while constant beam helps gauge their distance. Pedestrian friendly Zoom mode alerts those around you with a slow and gradual change in brightness. Enhanced Cycling Optics provide extra wide and long range coverage. Low battery indicator for power awareness. Light mode memory recalls last mode used. Water resistant design for all riding conditions. Seat post and seat stay mounts included. Lightweight 59 g. 150 lumen flash output Seat post and seat stay mounts included Water resistant design for all riding conditions Light mode memory recalls last mode used Enhanced Cycling Optics provide extra wide and long range coverage