Cygolite Hotrod 50 lm USB Rechargeable Bicycle Tail Light Powerful 50 Lumen with cluster mounted array of LED work in unison for an extra wide and powerful tail light output, maximizing your visual presence Steady pulse mode: alert motorists with pulses while lighting the path at night 6 lighting modes: high flash &gt; high steady &gt; group &gt; Zoom &gt; steady pulse &gt; low flash; lasts up to 100 hours on a single Charge Extra compact (29 g) , water resistant, and USB Rechargeable with internal Li-Ion battery Includes tail light, Micro USB charging cable, versatile flexible seat post/stay mount