Serfas Thunderbolt 2.0 USB Bike Tail Light

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The Serfas True Series light line was developed to be the best on the market. Given the True stamp of approval, these tail lights will meet and exceed their expected lumen output while offering you all the features you've come to enjoy from Serfas lighting. Please welcome the new line of True Series lights, and be prepared to turn night into day.


  • Super Bright (50 Lumens) *Daytime Flash
  • Auto Safe Mode
  • Last Mode Memory
  • USB Remote Switch Compatible
  • Aero Post Compatible
  • USB Rechargeable

Solid Modes:
High (25 Lumens): 1.5 hrs, Medium (15 Lumens): 2.25 hrs, Low (10 Lumens): 5.5 hrs
Flash Modes: *Daytime Flash (50 Lumens): 19.5 hrs, High Flash Slow (25 Lumens): 9.5 hrs, High Flash Fast (25 Lumens): 5 hrs, Low Flash (10 Lumens): 13 hrs, Auto Safe Mode Extends Runtime an Additional 45 mins
Weight: 40 Grams with Bracket
Battery: 500 mAh Lithium Polymer

This product was added to our catalog on September 9, 2016.