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correction to your scheme: Neutral wire should go through the ring to calculate Watts value, not the Line.
In my case working with Line wire. For example look at this video : th-cam.com/video/1m7hRxUzvGQ/w-d-xo.html
Does this have back up battery and memory to hold data?
No and no, it has not.
at least my packaging is printed in English
correction to your scheme: Neutral wire should go through the ring to calculate Watts value, not the Line.
In my case working with Line wire. For example look at this video : th-cam.com/video/1m7hRxUzvGQ/w-d-xo.html
Does this have back up battery and memory to hold data?
No and no, it has not.
at least my packaging is printed in English