You need a fixed adapter coupling Schuko type 12, CEE 7/7. The German plug must not be replaced by a Swiss type!

There are 3 interchangeable plates :sandwich, waffles and contact grill

Digitec (or any other Swiss dealer) is obliged to deliver electrical devices with a Swiss plug. If the device comes with a foreign plug, a suitable replacement cable should be supplied if the power cable is pluggable or, alternatively, if the power cable is firmly connected, a suitable adapter should be supplied. If the device comes without a suitable plug, complain to customer service and insist on a cable or adapter, free of charge. Infos Digitec --> https://helpcenter.digitec.ch/hc/en-us/articles/4402084170386-Missing-Adapter #1 --> https://www.esti.admin.ch/de/themen/faq/elektrische-erzeugnisse-marktueberwachung/