Heating Cooling Units

How are HoMedics PM-30BX On-The-Go Battery Mini 3 Node Massager done. What generator do they contain?

What kind of concepts of physics use to build something like that? What makes it vibrate. How does it work?

MOST likley they contain electric motors with rotors eccentrically weighted .. see Wikipeda (link 1) PS if you look, be careful what you type in (or you'll have plenty of references to a particular kind experienced adult toy )

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