How does communication between devices in the NOW System take place? 09 November 2021 09:26 Updated The Connection Unit communicates with IRSAP NOW devices via RF (radio frequency, 868Mhz). Related articles Connection Unit Setup Where should the Connection Unit be installed? What do I need for the Connection Unit to work? I don't have an Ethernet cable, can I connect the Connection Unit to WiFi? The Connection Unit LED doesn't switch on, what should I do?