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The Serfas Thunder Blast Rear Bike Light is a motivated illumination companion. It's got your back with 40 lumens of rear-facing microLED power, keeping you safe with solid or flashing modes. And when it senses its power is running out, it blasts out a loud beep to let you know.
40 Lumen Red MicroLEDs
USB Rechargable Li-Polymer
Flash Modes – High (40 Lumens): 4 hrs / Low (10 Lumens): 15.25 hrs
Solid Modes – High (40 Lumens): 2.25 hrs / Low (10 Lumens): 7.75 hrs
Aero Post Compatible
"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.
Charge Indicator Light
Extra Long Mounting Straps