An Apple Ring would track health before anything else

What to know

An Apple ring would likely focus on health, based on Apple patents that describe sensors for heart rate, skin temperature and other health measures. A patent protects an idea. It does not mean a product is coming.

Sleep tracking could be the biggest draw, since a ring is comfortable to wear overnight. Blood oxygen also appears in Apple's patents, which fits how most of Apple's wearables focus on health.

Apple has not announced a ring.