For me it’s the notification light you used to find on older phones, was particularly good to know if your phone was charged without picking it up
For me it’s the notification light you used to find on older phones, was particularly good to know if your phone was charged without picking it up
You you mean electropermanent magnets?
Idk if that’s another name for them, but what I meant was polymagnets
Those use arrays of electropermanent magnets