Can I use my Zigbee product on everywhere?

Hi everyone, I have a question that I cannot find a direct answer to. I hope you can help me!

I am designing a product that is being planned you use Zigbee communication protocol in between its devices or nodes. However I am not in US or Europe so in here Zigbee uses 2.4 GHz frequency band. As far as I know Zigbee uses this band internationally, but I also see that in US Zigbee band is 915MHz and in Europe it’s 868MHz. How could this be possible when it was international?

Also, the plans include selling this product both to US and Europe. Will this different frequency bands create an obstacle?

I think what you mean is that you have a 2.4 GHz Digi XBee product. If that is the case, then yes, if you use the international version of the module (J is listed at the end of its part number), then yes, you can use it in both the U.S. and Europe.