If you're in a country using 220 or 230 voltage, Series 1 Pro or Series 1 with a Heated Build Platform, this is the article for you.
By now you're probably aware that the heated bed only works on 110V (the voltage used in the US.) The Series 1 is designed to work at any voltage, but the heated bed is not. That means you'll need to convert your power down to 110V for the heated bed to work. Please be aware, that running the Series 1 Pro with heated bed using incorrect voltage can cause property damage, including damage to the printer, or burns.
To convert your voltage, you'll need to buy a transformer of at least 750 watts to be safe. This is because the Series 1 Pro uses at most 600W at any given moment. We recommend that you buy a transformer with extra fuses, simply for safety (and to keep you printing!).
This Amazon search should help you find a proper transformer. If you would like to verify if a potential transformer works for your machine, we can help. Our support team is standing by to answer your questions, contact them here.