Briefly pushing the button alternates the total distance displays (e.g '99910.9') with the partial distance displays (e.g 't 176.8').
The total distance function counts the total mileage in kilometers or miles up to 999999.9 max.. This display cannot be reset.
The partial distance function counts the mileage in kilometers or miles up to 't9999.9'. This displays is reset to 't0.0' by pushing the button (for 2 seconds approximately).
Pushing the button for 2 seconds when total distance is displayed will also reset the partial distance to 't0.0'.
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