Ke hoʻokomo ʻia ka mana hoʻololi i ke kani, lilo ka magnet i electromagnet. Ke hoʻololi mau nei ka ʻaoʻao o kēia manawa, a ke neʻe mau nei ka electromagnet i hope a i waho ma muli o ka "neʻe ikaika o ka uea ikaika i loko o ke kahua magnetic", e hoʻohuli i ke kīʻaha pepa e haʻalulu i hope a i waho. He kani ko ka stereo.
ʻO nā mea magnet ma ka pu ka nui o ka ferrite magnet a me NdFeB magnet. Wahi a ka noi, hoʻohana nui ʻia nā magnet NdFeB i nā huahana uila, e like me nā diski paʻakikī, nā kelepona paʻalima, nā headphone a me nā mea hana pākaukau. Nui ka leo.