most devices can be used elsewhere. there's certain changes/modifications needed.
1. power. not all places use same power requirements. potentially a different power supply is needed.
2. firmware. each region has its own broadcast restrictions. So each region will have a different settings for that region. Some require a different firmware specific to that region.
3. Patience. sometimes changing the region requires some computer work/skills. see this thread for example. https://community.netgear.com/t5/Nighthawk-WiFi-Routers/R8500-how-to-unlock-wifi-region/td-p/1495922
If you're not comfortable doing stuff like this, buy a router specific to your region.
so its not as simple as just taking a router elsewhere and plugging it in.