Smart watches will get you killed at night. Al-Qaeda used the Casio F-91W - which is cheap, extremely common, weighs nothing, is water resistant, has a button for the screen light, doesn't
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CASIO F-91W (Module 593) - How to Set the Time, Date, Alarm and use the Stopwatch. - YouTube
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User manual Casio Collection F-91W-1YEF (English - 1 pages)
How to set a Casio F-91W watch - manual for correct digital setting - YouTube