Once in place, the iPhone or the iPhone case will be able to attach to MagSafe accessories and chargers. Adding a magnet to an iPhone 11 will let it work with MagSafe items, but when it comes to charging, it's not going to charge faster. iPhone 11 models are limited to a maximum of 7.5W charging when charged with MagSafe chargers, unlike iPhone 12 models that can charge at up to 15W (12W for Cf2w.