Or as low as 
The USB Rechargeable Rapid X provides a bright, powerful glow with incredible side visibility. When the battery runs low, the low battery “Auto Save” function automatically changes the light pattern from the current mode to flashing, providing an additional hour of riding safety. 6 modes. 2 Hour charge time.
Dimension： 74.2 x 24.4 x 30.8mm
Weight： 22.5g (with batteries)
Light source： COB LED
Battery： Lithium Polymer rechargeable battery
Runtime：
High mode：
1 hr
Low mode： 5 hrs
Flashing mode： 30 hrs
Rapid mode： 16 hrs
Pulse mode： 16 hrs
Vibration mode： 8 hrs
Recharge time： 2 hrs (USB recharge)
Mount size： Rubber band mount (fits φ 12.0-32.0mm)
Other : Battery auto save, Low battery indicator, Lighting mode memory
※ The factory-loaded battery life might be shorter than the specification above.
※ Design and specifications are subject to change without notice.
