Yes it should work on 220v, I have several and I live in NZ which is 220v. There are two versions, 1 has a socket for a power cable - in which case you need a cable with the correct plug for the ship's outlet
Where are you going on your cruise? 😎
2. If it has two straight prongs that fold away, then you need an adapter - not a voltage adapter, but just one that changes the prong configuration.