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The Serfas Thunderblast Front Bike Light can see into the future: when it senses its batteries running low, it lets out an 85 decibel alert to tell you it's time to either pedal harder or switch modes. That's smart!
100 Lumen Output – Super bright microLEDs lead the way.
USB Rechargeable Li-Polymer Battery
Solid Modes – High (100 Lumens): 2 hrs / Low (20 Lumens): 7.75 hrs
Flash Modes – High (100 Lumens): 3.5 hrs / Low (20 Lumens): 14.5 hrs
Extra Long Mounting Straps for Endless Mounting Options
"Blast" Audible Warning System (AWS) – 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. Sound will continue every minute.