Smartwatch VO2max Precision Prime heart rate monitor GPS running watch long battery life sleep analysis```html Product Highlights Equipped with the Polar Precision Prime sensor featuring 10 LEDs in 3 colors for highly accurate heart rate measurement. It can detect the state of blood flow in different layers of the wrist, achieving even more precise heart rate monitoring. While maintaining measurement accuracy, the contact surface with the skin has been made flat for even greater comfort. Improved GPS with a newly installed built in antenna enhances GPS