A "plug socket" refers to an electrical outlet or wall socket where you can connect plugs to get electricity for devices like lamps or appliances. Full definition
And when it finally comes down to charging it, a simple domestic plug socket will do the job. (evo.co.uk)
You'll need to have an available plug socket wherever you place it, though, as the One requires constant power. (pocket-lint.com)
In - car connectivity is enhanced with up to 14 power points, including a domestic plug socket to keep laptops and other devices topped up. (greencarcongress.com)