Apple Watch Ultra 4 is coming on September 9, here are the key ways it’s rumored to differentiate itself from prior models.

‘Significant upgrade’ to health sensors

Digitimes has reported on multiple occasions that Apple Watch Ultra 4 will bring significant upgrades to internal sensors. It went as far as saying “the number of sensor components will double.”

Mark Gurman reported this week that “upgrades to fitness tracking” are coming. And there’s evidence that a new high blood pressure-related feature has been reviewed by the FDA for release soon.

Though many specific details around these sensor additions are still unknown, it sounds like Apple Watch Ultra 4 could lean more than ever into health and fitness tracking.