Fullfills ISO and ANSI RAB Certification. Used by computer operators since 1998. Ideal for airline crew and passengers exposed to high EMF fields. Recommended by Doctors to reduce electromagnetic stress.  These protectors help disperse electromagnetic fields effects on our bodies.  Check out our video explanation here.  You may wear it so that it hangs about at the level of your sternum or you may keep it in a pant pocket with you so that it is always in close contact with your body.