---MIKE--- wrote:
I just bought a cheap electric alarm clock - made in China naturally.
When I plugged it in it displayed the correct time. How does it do
this? Does it pick up a radio signal? The clock works perfectly. I am
just curious.


---MIKE---
In the White Mountains of New Hampshire
(44° 15' N - Elevation 1580')


Probably. I have two clocks like this and a watch, all battery
operated, but you have to set them to your time zone. They are set by
transmitted atomic clock signals and time is exact.