Serfas® batteries are covered by a 1 year warranty from the original date of purchase.

The Serfas® UTL-6 Thunderbolt Tail Light gives you style and safety in one high-powered & affordable package.

Being seen on your bike at night never looked so good with Serfas’ Thunderbolt (UTL-6) Taillight. USB rechargeable convenience and 35 lumen output while giving riders versatile mounting options.

Features:

• 35 Lumen High/High Flash
• USB Rechargeable
• Charge Indicator Light
• Removable Straps Allow Endless Mounting Options
• LED Strip Creates a Non-Directional Flood Of Light

Specs:

• Modes:
  • High – 35 Lumens, 1.5 hrs
  • Low – 10 Lumens, 4 hrs
  • High Flash – 35 Lumens, 2.5 hrs
  • Low Flash – 10 Lumens, 8.5 hrs
• Weight: 48 Grams With Bracket
• Battery: 500 mAh Lithium Polymer
• Color: Black