This means that the device has a German plug. A CH adapter is included in the delivery. The whole plug is slightly more unwieldy due to the adapter but otherwise no disadvantage.
There are two versions, NT 22/1 Ap L and NT 22/1 Ap Te L with the additional socket. Galasus sells the version without the socket. I also suspect that it would not be legal to sell the EU version with the socket in Switzerland.