The sale does not have to be prohibited. Digitec should simply comply with their legal obligations.
Conversion plug = adapter?
If the power cable is plugged into the monitor/power supply, do not use an adapter but replace the entire cable. This only offers advantages.
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Digitec (or any other Swiss dealer) is obliged to supply electrical appliances with a Swiss plug. If the appliance is supplied with a foreign plug, a suitable replacement cable should be supplied if the mains cable is pluggable or alternatively if the mains cable is permanently connected, a suitable adapter should be supplied.
If the appliance is delivered without a suitable plug, complain to the customer service and insist on a cable or an adapter, free of charge.
Info Digitec -->
https://helpcenter.digitec.ch/hc...Point 1 -->
https://www.esti.admin.ch/de...