SIGMA ONYX CLASSIC - Manual (Page 25)

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2.2 KEY OCCUPANCY
Top button:
k Start /stop the stopwatch
k Reset the stopwatch (hold down)
k Open and confirm the settings“
Bottom button:
k Change between functions
k Open the settings menu (hold down)
k Change the value in the settings menu
Pressing both buttons
simultaneously:
k Activate the light function
k Put the clock into sleep
mode (hold down)