The latest version of Inner Balance has a Bluetooth capability feature already built in.
If you do not have Bluetooth turned on for your device, you may get a notification that asks you to activate Bluetooth in order to run that kind of sensor.
Tap – Settings and it takes you directly to the Bluetooth setting of your device.
If you are on an iOS device and don't have that kind of sensor, you do not need to turn on Bluetooth in order to run Inner Balance.
Tap – OK and you may use your Lightning plug-in type sensor.