I've had this clock radio for a long time. It's made by Timex, and it's auto-set. You just plug it in the wall and the correct time is displayed (off by a few minutes). It came with batteries, but you have to put them in yourself, yet they know the right time. Does anyone know how it works? Like some weird algorithm or something. Or is there just another battery on the inside? What if the clock was taken to a different time zone then, would it still know the correct time?