This question is an extension of How much power do smart sockets consume themselves?, namely, do smart sockets consume power while turned off, as opposed to when they are put on standby?
Some smart sockets, such as the TP-Link HS100, come with an additional power button that allows you to turn the device off entirely. In this mode, many of the features of the device are turned off, such as lights, Wi-Fi and software. However, does the socket still consume a small amount of electricity in this state? More than it would if it were unplugged or had the socket it was plugged into switched off?