The Inner Balance™ Trainer Bluetooth Sensor uses BT4.0 (BTLE- BlueTooth Low Energy) which works at an output power range of 0.5 milliwatts (mW) or less – this is significantly lower EMF radiation than mobile phones which typically have output levels between 250 mW and 2000 mW.
The tiny Bluetooth emitter is in the module that attaches to your garment, not in the ear sensor.
Inner Balance Bluetooth Sensor is compliant with applicable FFC tests.