Apple Watch Series 9 and Apple Watch Ultra 2 have stopped supporting the company's blood oxygen feature in the US. The Cupertino company has disabled the pulse oximetry feature on its smartwatches, in order to dodge a US ban for infringing on patents held by Masimo. Apple is also informing customers who purchase these two models in the US that they will not be able to measure their blood oxygen saturation (SpO2) levels on both models.
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