Cateye Rapid X USB Rear Light

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.

Use SJS part: 38666 to convert to Cateye Square mount .
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 f 12.0-32.0mm)

https://www.youtube.com/watch?v=RRdvDIgjy7M