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Serfas Thunderbolt USB Rear Light - USB Read more..
• Single Strip high power LED w/ USB
• Integrated Li-ion rechargeable battery
• Up to 5.5 hrs of runtime
• Taillight visibility: 0.5 km’s
• Modes: High, Low, & 2 Flash modes
• Integrated USB plug
• Quick release rubber strap
• Available in 4 exciting colours
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