NiteRider Sentinel 2W USB Rechargeable Taillight

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The powerful 40 watt Sentinel incorporates cutting edge technology, projecting laser lanes providing a highly visible barrier between rider and vehicles.
Visible from over one mile
Run Time/Modes: 18 hours on Flash1, 7 hours on Flash 2, 4.5 hours on High Steady, 36 hours on Low Steady
Highly visible laser lanes
Ultra bright 40 lumen output
USB rechargeable
Group Ride Mode: be seen without annoying fellow cyclists