What voltage does the Wiser Smart Plug support? Follow Works with standard UK mains wall socket (230V a.c.). Related articles Can I plug any electrical device to the Wiser Plug? What happens with my Wiser Plugs when I activate Wiser’s Away Mode? How many devices can one Wiser Plug support as an RF signal range extender? I bought a smart plug to use as an RF range extender for one of my radiator thermostats. Can I move this plug to another wall socket? (WH) Getting to know your Wiser Smart Plug