The Magnetic Ring

it's a rock.
it moves a compass needle.

tibetan magnetic serpentine — naturally occurring magnetic stone,
worn as a thumb ring. hold a compass near it.
watch what happens.

no explanation required. no batteries. no settings.
it has been doing this since before you found it.

material: tibetan magnetic serpentine
size: inner diameter 0.86 in, width 1.1 in, weight 1.5 oz
magnetism: genuine, natural, permanent

no instructions included. the compass already knows.

go play.