It looks like you may be using an Apple® device with a web browser that does not support bluetooth connectivity. In order to use a bluetooth-capable heart rate strap, you will need to use the Bluefy app.
/ Device Detected
Unfortunately your device or browser does not support bluetooth connections. If you know that your device supports bluetooth, we suggest trying a different browser like Chrome.
If you are using an iPhone® device, we recomment using Bluefy.