Serfas Thunder Blast Tail Bike Light

If you're tired of guessing how much battery life you have in your lights, the Thunder Blast Tail Bike Lightfixes that with Serfas' blast audible warning system. The Serfas Thunder Blast Taillight gives you style and safety in one high powered and affordable package. Capable of alerting you with a loud 85 decibel signal, the Thunder Blast let's you know when 10 minutes of battery life remains. Blast Audible Warning System Solid Modes: High 40 Lumens 2 hours, Low 10 Lumens 7.75 hours Flash Modes: High 40 Lumens 3.5 hours, Low 10 Lumens 14.5hours Weight: 48g without bracket Battery: USB rechargeable Li Polymer Extra long straps included