Masimo originally sued Apple over the blood oxygen monitoring feature in January of 2020. According to Masimo, Masimo and Apple had initially met in 2013 to talk about a potential partnership or acquisition, but Apple instead poached Masimo's engineers to implement the feature on its own without Masimo's involvement.

Apple was forced to remove the blood oxygen monitoring two years ago amid a patent dispute, but a software update coming later today will revive the feature.