@nazokiyoubinbou @robhon You're getting some bad/incorrect info here. Pulse oximetry has been around since the early 70s. Their patent only covers a wrist warn, curved sensor with an array of LEDs. They hadn't even been able to make it into a watch yet when Apple released the Apple Watch. However Masimo has now released a watch that looks exactly like an Apple Watch, copying Apple's implementation of a touchscreen device.