I have never owned a "smart" device of any kind. I am a tad 'neanderthal' since I lived off grid between 2004 & 2008. I hard wire via my landline to access the internet and I have an earthing plate under my bare feet when I am at my desk. I monitor EMFs in my environment with an Acousticom2 meter & am shocked by the invasion of signals from my neighbourhood & (presumably) from satellites.

I have never had much faith in claims made about shungite or similar. Why do you trust their efficacy?