[KongchangAI]
Unverified50% confidenceOpinionExact time

The F-91W's mode switching is suitable for abstraction using hierarchical states, with the top level being time mode, alarm mode, stopwatch mode, and hourly time signal setting; the Mode button handles top-level transitions, the Adjust button handles entering and traversing editing substates, and the Light button is a global instantaneous action.

1
Sources
50%
Confidence
Long-term
Relevance
10/16/2026
First Seen

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