Do you want to pair your sensor? First go to the Bluetooth settings of your smartphone and select the Shapeheart sensor.

Forget about the Shapeheart heart rate sensor once it is turned on if you have already paired it in your iPhone settings.

Then deactivate the Bluetooth.

Once in the menu, click on heart rate monitor.

Select "Connect Now".

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