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Basically the top horizontal one, when it's time to turn, it light up from left to right repeately if there's a right turn soon (for example), it's noticeably easier for the like of me to see a turn.
The vertical one, useful to do Strava segment on, during a starred segment, blue in middle is "on track", orange above mean you're ahead, and green below is you're behind.
What do LED's do?