The magnetism in some models was designed with selfies in mind so you can attach tablet to the fridge or likewise. Unfortunately those of us with internal pacemakers and defibrillators were not considered. There is no mention or warning that comes with the devise. I make a point of keeping the back of the tablet away from me but I have had occasion s when the magnetised back has set the alarms off from my defibrillator to warn of interference from magnets which can interfere with the function and settings of my defibrillator. Samsung are noteable by there absence of concern in this matter.