I was curious about this myself... @lanieg so I Googled it:
https://www.google.com/search?q=what+are+hbot+and+pemf+mat+used+for&oq=What+are+hbot+and+pemf+mat%3F&aqs=chrome.2.69i57j33i160l5j33i299.8375j0j9&sourceid=chrome&ie=UTF-8
It was easier for me to share the link than explain all the various treatments. Have a good one..💞