I think the signal is sent to the 'gismo' via a home area network (according to the link).
I got smart meters fitted so that I didn't have to keep reading my meters. The 'gismo' shows your usage at any one time but as you already know, a kettle uses more electricity that a light bulb, so I can't see the point of the 'gismo' apart from novelty value. After ten minutes, I disconnected mine and put it a drawer.
Check out the link:
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