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@hippy
"prototype Sinewave Cycles dynamo... features a very bright beam, USB charging, and a unique battery power mode where the light can be provided additional power from a standard cache battery which allows for substantial light output at low speeds and while stopped. Dynamo lighting typically flickers and dims at low speeds, but with a battery backup the light remains bright even when walking the bike up a steep grade or churning through the sand at 3mph."