KET-RMB are repeaters with extended radio range that connect the concentrators to all other X-Monitor devices, even on large buildings/installations, creating a real network of nodes without the risk of interference with other frequencies and without major or invasive masonry work. KET-MUM modems ensure WLAN connection even in places where the local one is absent or unavailable; with the SIM management service it is not necessary to search for mobile phone contracts for data traffic.