They're great. I use them in my trailer to turn off things I don't need. I usually drive on batteries charged by a solar panel so I don't waste energy. I used to have to unplug things like the TV, which uses little power even when it's off, or the laptop, which I usually only charge when it's sunny, now I just flick the switch. Interestingly in Scotland all the sockets I saw had built in switches, probably to save energy. I've been looking for some of these in the US but couldn't find them, that's the best I could do. A switch on the side allows two to be used in a double socket; Some other switches had the switch on top which would mean only one could be used in a double socket.
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