Circular is a relatively small player in the smart ring segment, which is currently led by the likes of Oura, Samsung, and ...

For example, optical sensors tend to provide more reliable heart rate measurements during rest and sleep than they do during ...

For now, the ECG app is only available in the US, but that doesn’t mean that others can ... rate reading also measures faster and with more accuracy as it updates every second versus every five ...

Made out of jewelry-grade titanium, the smart ring comes equipped with an ECG, PPG, as well as a temperature sensor. The watch can measure heart rate, HRV, blood oxygen saturation levels ...

And because it’s also quite simple to implement the required sensors, it makes sense that electrocardiogram (ECG) machines are a popular choice among introductory medical electronics projects.