Want to pair your sensor? Start by going to your phone's Bluetooth settings and select the Shapeheart sensor.

Forget the Shapeheart heart rate sensor once turned on if you've already paired it in your iPhone settings.

Then disable Bluetooth.

Once in the menu, click on heart rate monitor.

Select "Connect now".

Don't forget to enable Bluetooth. The Shapeheart sensor, when turned on, will change from white to blue on one side and start flashing green on the other side.