It's a dynamo light, the beauty of them is you just leave them on.
More visible, more of the time.
Not if you want to use a USB converter to charge stuff. The dynamo hub won't provide enough power to do both properly.
Yeah, because that happens a lot.
"More visible, more of the time." is still not "all of the time" if you want to be pedantic with edge cases.
@Brommers started
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It's a dynamo light, the beauty of them is you just leave them on.
More visible, more of the time.