FEATURES of the Serfas Thunderbolt 2.0 Tail Light Auto safe mode Last mode memory USB remote switch compatible Aero post compatible USB rechargeable High, medium, low, daytime flash, high flash slow, high flash fast & low fl...

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FEATURES of the Serfas Thunderbolt 2.0 Tail Light Auto safe mode Last mode memory USB remote switch compatible Aero post compatible USB rechargeable High, medium, low, daytime flash, high flash slow, high flash fast & low flash modes

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