Powerful 50 Lumen tail light with sop Technology that lets you Independently adjust brightness and flash speeds;Steady pulse mode: alert motorists with pulses while lighting the path at night;6 lighting modes: steady > Zoom > steady pulse > triple flash > single flash > random flash ; lasts up to 500 hours on a single Charge;Extra compact (55 g) , water resistant, and USB Rechargeable with internal Li-Ion battery;Includes tail light, mini USB charging cable, seat post mount, seat stay mount