Can I use the Wiser 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? Getting to know your 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) How many devices can one Wiser Plug support as an RF signal range extender? Can the Wiser Plug be used on an extension lead? Comments 0 comments Please sign in to leave a comment.