Wall chargers are they dual voltage

Will wall chargers made for US market (110 v nominal) work overseas with 220v electrical grid.

Almost all USB wall chargers made these days support 100-240V input. Meaning they’ll work in every country, provided you use a basic wall plug adapter as needed.

On your charger the specs are printed on the brick. Check out the voltage range to verify it includes what you need for where you’re going.