Cordless Headphones

[ringfinder1962]

I wonder if there has been a conclusive study to prove that cordless headphones cannot induce certain brain cancers. Placing radio transmitters near to the brain could be risky, Could be that old fashioned wired headphones are a long term safer bet. electromagnetic fields have been shown to interfere with brain waves, so called alpha wave sleep generaters work to slow down brain waves by impulse energy, so never totally believe that wireless headphones or mobile phones can be totally safe. this is most scary with microwaves which could excite molecules in your brain to produce heat. .Beware of farts that dont smell.

[Fusion]

Cordless headphones have a radio RECEIVER in them, the transmitter is inside/plugged-into the detector. And that transmitter is typically less than 10 milliwatts (v.low) because it only has to give a few metres range, and if it were any more powerful it would interfere with the detector operation, drain batteries unnecessarily, interfere with other equipment etc.
You could try infrared cordless 'phones. They get round the problem of detector interference, but may be a bit power-hungry and have troublesome directional qualities.
Also, the metal detector is a radio transmitter - from the search coil. Again, 10 milliwatts max., typically.