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Powercords.co.uk has a lot of information on electrical variations all over the world... but if your Visor Edge is still under warranty, the first place you'd want to look is Handspring.com. ;)
Think of alternating current electricity as a repeating wave: The voltage measures the height of each peak and valley in the waveform... The frequency is how many waves there are per time period.
US "standard" power is generally 110V, 60Hz. European power is generally 220V, 50Hz. We got faster waves in the US, but European waves are bigger.
For sensitive electrical equipment, you want to make sure your power converter straightens everything out properly: voltage and frequency.
They say it will handle any AC outlet from 100V to 240V. You could email them to confirm it will handle 50Hz power also.
Re-reading my last post, I think I gave a really stupendously oversimplified explanation... if you want to know the truly painful details of it, this [pcguide.com] explanation is more complete.