Although it was quite late to jump on the wireless charging bandwagon, Apple’s implementation did eventually introduce an element that, truth be told, should have become standard in almost all wireless charging systems today. Just like many of its small but significant conveniences, Apple used magnets to bring a bit of stability when wirelessly charging the iPhone 12. Impressive as it may be, the iPhone 12 and its matching MagSafe accessories had one side effect that may have gone unnoticed until recently.
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https://www.slashgear.com/iphone-12-magsafe-could-interfere-with-pacemakers-24656486/