One of the favorite electronic device I love to have is bluetooth stereo headset. Though I am fancy about it, I wanted to know which one is worst between cellphone and bluetooth. I did questions about it with many guys but there nothing is conceivable.
Many electronics and communications engineers argued that bluetooth is of a higher frequency(2.4GHz) and mobile is of low frequency(800MHz -2100MHz) and hence mobile is more safer than BT.
But in reality, the frequency is not the matter of concern* , only the power matters. The power radiated by a BT headset is 0dBm(1mW) where as a mobile set will radiate up to 33dBm(2W).The power radiated by a mobile set depends on the distance between the tower and mobile set. Though we are not talking in the cellphone, the cellphone will continuously communicate with the tower to register its presence within the cell(a radiation circle where one tower influences on the device). Weaker the signal received by the cellphone, it will boost the signal level to communicate with tower.
Also my thinking is that, if the cell phone is close to the body, the body capacitance also influence on the power as signal will couple more to the body rather than reaching the tower.(discussion needed).
Hence, it is better to use bluetooth headset and it is not good to hold the mobile set near to your body (either close to ears/in pockets).
One interesting fact, though frequency is not a matter of concern, in case of bluetooth frequency has one special case. It happened that the natural frequency of water molecule is also 2450MHz(source:http://www.esato.com/archive/t.php/t-29390,1.html). This coincidence frequencies create heat effect in the body flesh. Read above link for details.
Finally, bluetooth rocks, please close your white teeth...~:)
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