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This is why I NEVER put bluetooth tech in my ears. I have a bluetooth device that my head phones plug into and it stays away from organs that are mostly liquid (I know that is relative).
A quick check to do on something is to check the output power and frequency and then go to the ARRL rf exposure calculator (http://arrl.org/rf-exposure-calculator) and type in the numbers.
By law, being a amatuar radio guy, I have to do these calculations and be able to provide them to the FCC if they knock on my door.
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no problem, The basic rule of thumb is the higher the frequency the further the safe distance is for the same power.
One of my antennas at 100 watts has a safe distance of about 2 feet at 3.9 MHz but my antenna at 50 watts at 146MHz has a safe distance of 12 feet.