All grounding products are supplied with an EU grounding plug for sockets type E & F (for Belgium, the Netherlands, France, Spain, Portugal, Germany, Italy, Denmark, Austria, Greece, Poland, Czech Republic, Slovakia, Hungary, Slovenia, Bosnia, Serbia, Croatia, Montenegro, Romania, Bulgaria, ...).
For Great Britain, Switzerland, Italy you will find the earthing plugs (adapter) here.
For USA and Canada, you do not need a grounding plug. The pin of the connecting cable of each grounding product fits directly into the wall socket.
For other countries any traveller adapter from EU to your local socket works.