The Kärcher MV 3 P's for the price certainly a very passable sucker.
When acquisition for the construction area (interior design - drywall within the home) it served its purpose.
The function, an e-device (such as the eccentric sander) to couple to the Kärcher that it turns on when the connected e-device is put into operation, is very much worth it.
Unfortunately, it is also inexplicable to me why only one adapter is included, which you then have to cut to the respective electrical appliance. I have this now tailored for the suction of the eccentric grinder and thus the adapter is probably suitable only for this more.