Sharper Image SN005 - Manual (Page 14)

Auto Synchronization
The watch is a radio device and, like a mobile phone or
the radio, in certain locations and times of day, it may not
pick up a strong enough signal to synchronize. If the watch
fails to synchronize in the first attempt, it reattempts every
2 hours for the first 3 days. In most cases, the watch syn-
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Radiating
Beacon
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