According to a recent support page, Apple said that the magnets and electromagnetic fields in some Apple products might interfere with some medical devices. The reasoning behind this is because some medical devices—Apple names implanted pacemakers and defibrillators as two examples—might contain sensors that respond to these magnets when they are in close contact.
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Apple is recommending that customers keep their Apple devices and medical devices at a safe distance of at least 6 inches from each other.