How can I damage them?

XBee & XBee Gateway Other RF Products
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1

Thanks for your answer.

Just curious, in what way can I damage them? Is it because the Arduino is a 5V device and the S2C is a 3.3V device?

Thanks

2

Yes, without a level shifter and a voltage regulator from 5V to 3V you will burn up an XBee module.