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According to different articles, it's completely safe to use

The technology is safe. No evidence suggests that the radio frequency signals used by SkinTrack have any health effects. The body is commonly excited by daily appliances — everything from the tiny amounts of current drawn from the finger by touchscreens to the electromagnetic noise emanating from fluorescent lights — with no ill effects.
https://www.cmu.edu/news/stories/archives/2016/may/skintrack-technology.html

And thank you for noticing the steemit logo! ;)

@sirwinchester
Thanks so much for sharing the link. That's encouraging to know that the technology is safe. It looks cool! Keep up the good work with your creative blogs! :) I wish you all the best!