Power reserve indicator

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Blancpain L-evolution Réveil GMT with power reserve indicator for the movement as well as for the alarm function
© Blancpain

Dial indication

The power reserve indicator shows the condition of the mainspring and thus the remaining running time of a watch. It reminds to wind the movement again. At A. Lange & Söhne it is also called UP-and-DOWN indication (AUF-und-AB-Anzeige).

There can also be power reserve indicators for further functions, for example the alarm function.