This phrase was used of an appliance that connected to an electrical outlet; now it's an add-on for a browser
[DOC] [TLE] Wi-Fi Smart Socket - Merlin Digital [PAR] Set schedules for your electrical appliances to turn on or off at specific time ... 
Once connected to your home WiFi network, Smart Socket lets you turn on or off 
your ... Now, no need to worry about the light that you left on in your bedroom or 
the ... to control my electrical device with the help of my smart phone its easy to 
use it... [DOC] [TLE] Why Does My Electrical Outlet Spark?