1. can someone explain to me why the other three connections in the CH are sealed?
2. why can't a device with a three-pin plug be connected via an adapter?
Hello yes it is a bit confusing. I bought from Digitec not long ago. I got an Ecoflow without (sealing). I don't know why this is the case. .> safety aspect... but if there is a seal -> there is a plastic cover -> and this can be removed. Ecoflow has a EURO plug, adapter on it and that's it ... if you earth it ... Otherwise only the 2-pin plug. No three-pole plug because -> the power station is not earthed. It's best to look on youtube. It is well explained there-> is the same for all power stations, so no 3-pin plug on the device.