How much exposure to radiation do wireless bluetooth earphones cause?

More and more people are aware that holding a mobile phone to your ear during a call leads to excessive radiation exposure. Even Apple warns in its manual that you should not put the phone against your head. So it's safer to use the speaker or a headset. But which headset is the lowest radiation? And what about Airpods or other earbuds?

Bluetooth radiation

Wireless headsets work via bluetooth. That's a technology that emits electromagnetic fields (EMFs) similar to what comes out of your phone. There are many studies showing biological effects of EMFs. The point is, bluetooth earbuds sit in...