Polar has brought the features of the Grit X Pro to its Unite and Vantage V2 smartwatches. This month's updates enable pulse sensor mode, among other new features, that allows you to connect to fitness equipment via Bluetooth. The pair are now available in new styles and colourways, too.
https://www.notebookcheck.net/Polar-Unite-and-Vantage-V2-smartwatches-receive-updated-features-and-new-styles.571391.0.html