Can I use the Wiser Smart Plug outdoors? Follow No. The Smart Plug is for indoor use only. Related articles Can I take the Wiser Plug on holiday or use it outside of the UK? Can the Wiser Plug be used on an extension lead? Can I plug any electrical device to the Wiser Plug? 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) Wiser Smart Plug LED behaviour guide