The user manual for the Timex 1440 Sports watch on the Timex website is for a different model, not the #143-T5J131. It may be a newer version - mine was purchased in 2013 and was on sale. Someone asked this question in the past, but the link in the response is no longer active.
Testimonial: "The W207-M115-NA-EN manual (which is the one that comes up for the 1440 Sports on the Timex website) is for a different model watch that has atomic synchronization. My 1440 Sports watch, model 143-T5J131, does not. It's very confusing since they seem to call all similar watches "1440 Sports.""
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I forgot to add that the 1440 watch on the Timex website synchronizes automatically. My version does not.
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