Atari 2600 European Voltage Help.

Hello, I recently bought an Atari 2600 and It did not come with a power cord.
I managed to find one, but there is a voltage switch on it, so I have to set the right voltage.
If you know how many volts I need in order to play a PAL Atari 2600 in Europe and not make It blow up, leave an answer.
By the way, the power cord is capable of giving me power from 3 volts up to 12 volts.