Koga E-BIKE ION - Manual (Page 23)

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Arrow downwards means: current speed is below
the average speed of the ride.
Block means: current speed is almost the same as
the average speed of the ride.
With the option Average Speed you indicate whether you want to show the
indicator in the display or not.
2.8.6 Automatic Charging (optional)
With this function, the E-bike automatically generates energy when no
pressure is being exerted on the pedals. This allows the battery pack to
recharge while you are cycling.
Ask your dealer about the terms and conditions.
To use the function, you first have to switch it on via the display menu. You
can then use the red button to activate or deactivate automatic charging.