Blood Oxygen sensor

Masimo sues U.S. Customs and Border Protection in bid to block green light to enable blood oxygen monitoring on Apple Watches

Apple Watch Ultra 2 on desk with blood oxygen sensor LEDs active

When Apple released iOS 18.6.1 and watchOS 11.6.1 last week, bringing Blood Oxygen monitoring to previously excluded models following a U.S. Customs and Border Protection approval that allowed Apple to move forward with the “redesigned” experience on those devices, we had a gut feeling that patent troll Masimo wouldn’t let that go very far without a fight.