How does Chumby wake me up?

I'm thinking of getting a Chumby but I can't figure one thing out. If I use it as an alarm clock, does my computer have to be on to feed content to the Chumby? My computer is usually asleep while I'm asleep. Does it need to be "awake" to wake me up, or does it not work like that at all?
 
indifferent I’m unsure
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