You Do Need power plug adapter while traveling from Ireland (Eire) to Czech Republic.

Here is Why You Need An Adapter

The outlet and plug type used in Czech Republic are C and E and in Ireland (Eire) is G. This is how they look like.

In Ireland (Eire), outlets of type G are in use.

Type G

In Czech Republic, outlets of type C and E are in use.

Type C

Type E

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