I have a similar one, an Electron "Backupz" - there's a review of them on here: http://www.roadcyclinguk.com/news/article/mps/UAN/405/v/2/sp/
I wouldn't ever use it (I only have the front one) on its own, but i do in combination with a normal front light. I want my bike to look like a disco when it's dark so I'm seen :)
Quite useful to keep in my bag for emergencies, too.
@eeehhhh started
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I have a similar one, an Electron "Backupz" - there's a review of them on here: http://www.roadcyclinguk.com/news/article/mps/UAN/405/v/2/sp/
I wouldn't ever use it (I only have the front one) on its own, but i do in combination with a normal front light. I want my bike to look like a disco when it's dark so I'm seen :)
Quite useful to keep in my bag for emergencies, too.