Q&A: How does plugging in a clock radio, dvd player, tv know what time it is when you plug it in?

Question by Jerry G: How does plugging in a clock radio, dvd player, tv know what time it is when you plug it in?
The time is always the right time when you plug it in. How does this perform?


Ideal solution:
Answer by stephenfournierEither you have a battery in it that remembers the time or you have one of those clocks that picks up a local time signal and sets itself that way.

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