Serfas Thunderblast 40 Lumen Tail Light


Coming up with ways to make you safer on the road, when using Serfas lights, is a top priority. Their “BLAST” Audible Warning System emits a loud 85 Decibel signal when your light battery gets under 10-minute runtime in that specific mode.

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SKU: 713835020333 Categories: , ,
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How It Works:

– When the battery reaches 10 minutes of runtime, in its current mode, the light will emit a long beep followed immediately by a short beep. The sound will continue every minute.
– When the power button is pressed it will put the light in the next longest running mode & it will restart the battery low alert until 10 minutes of runtime in the mode is reached. Repeat as necessary. Example: Going from the highest mode to the lowest mode at the first beep could extend runtime up to 5 times.*
– Light will emit a beep sound repeatedly when the last minute of runtime in the current mode is reached.
– While charging the light the power button will blink blue. When full charge is achieved light will beep to notify charging cycle is complete.
– Light emits a beep when the power button is pushed & light goes from mode to mode.

– “Blast” Audible Warning System Alerts Rider Of Low Battery
– Design Easily Fits Aero Applications
– Low Flash Lasts Up To 14.5 hours
– Extra Long Mounting Straps For Endless Mounting Options

– Solids Modes: High (40 Lumens): 2.25 hrs & Low (10 Lumens): 7.75 hrs
– Flash Modes: High (40 Lumens): 4 hrs & Low (10 Lumens): 15.25 hrs
– Weight: 48 Grams Without Bracket
– Battery: USB Rechargeable Li-Polymer


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