What exactly does that mean?

:

Sealed AC outlet
This Power Station is supplied in accordance with Swiss standards, which is why only one AC socket is available. There may therefore be slight deviations from the pictures.

???

Question

What exactly does that mean?

:

Sealed AC outlet
This Power Station is supplied in accordance with Swiss standards, which is why only one AC socket is available. There may therefore be slight deviations from the pictures.

???

Answer

It has 3 Schuko sockets, all three carry electricity. 
Adapters from Schuko to CH plugs are also required. 
Whether you want to remove the inserted seals is up to you.
It is not a technical change to the appliance, so I can't imagine that it will invalidate the warranty, especially if you want to repair it, you can simply put the seals back in.

Answer

This means that "only" one of the 3 AC sockets at the front (see product images) can be used. The other two are sealed, i.e. they have plastic covers so that you cannot plug in any power cables.

I think, even if I haven't done it, that you could remove the plastic covers. However, this would probably invalidate any warranty.

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What exactly does that mean? : Sealed AC outlet This Power Station is supplied in accordance with Swiss standards, which is why only one AC socket is available. There may therefore be slight deviations from the pictures. ???