Cygolite Hotshot 50 lm USB Rechargeable Bicycle Tail Light 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 &gt; Zoom &gt; steady pulse &gt; triple flash &gt; single flash &gt; 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