

You definitely need to distinguish “electrical” devices from “electronic” devices but a safer approach is to read the plug.
- A power supply (ex. Phone charger) will be stamped with a voltage range and power draw, which probably includes everywhere but you can match it against the electrical service where you are. You may need a plug adapter but a simple mechanical adapter is sufficient.
- an electrical appliance (ex. Hair dryer) plug is probably not stamped with electrical requirements so the safe approach is to only use it in the intended country
Bank currency exchange is not available if you don’t know to plan ahead, and may not be convenient ever
There’s usually a $5 or more minimum, so less than that might as well be trash. Not convenient for tolls
The only option at the border was an ATM, where you can withdraw currency, converted from your bank, but in $20 increments.
Toll booths did not take credit cards or bank cards for an exact payment. This was before electronic tolling but that still might not be a thing at borders