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Emerson SmarSet clocks have an internal time-keeping chip set at the factory with the current time and date. This time is maintained with a lithium watch battery until the clock is plugged in. The chip also contains rules for daylight savings time adjustments. If power is lost the battery maintains the time until power is restored. A battery can last 5 years or more if there are not many power outages, but the original battery may last a much shorter time depending on how long it sat on the the shelf before being plugged in.

The clock comes preset to the Eastern time zone in the US. If used in a different time zone that zone must be set when the clock is plugged in for the first time. The time can be adjusted, like any other clock, and when changed the new time becomes the time that is saved.

It's sort of a cheap trick, but the idea is protected by US patent 6,567,344.

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