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As far as my research goes, "D/A" should be for the German market and therefore have a Schuko plug. "SM/A" should have a Swiss plug, but there are no technical differences according to the manufacturer's data. Perhaps someone here can share their experience who already has one of the two models.

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Technically, there are no differences. The linked version simply has Switzerland as the destination country and the other device is international. This results in different serial numbers and different offers for us.