Newer iPhones and Samsung phones with special cases use magnets to align and attach the power bank to the wireless power receiver in the phone. No more having to guess if you've got it lined up, it just snaps into place.
https://gamefaqs.gamespot.com/a/forum/2/2f3ddc0c.jpg
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Minutus cantorum, minutus balorum,
Minutus carborata descendum pantorum.