It is a matter of concern for some people that the carrier waves used by Bluetooth´s transmitters use the same frequency range as microwave owens (Bluetooth uses 2.402 GHz to 2.480 GHz). What does it feel like to get in the path of such waves?
Actually, the transmitting power is far too weak to be noticeable for humans. Moreover, the radiation is not concentrated in a beam, but dispersed more or less in all directions. When using a wireless phone or a Bluetooth device, some of the emitted RF energy is absorbed by the body. The penetration depth is about 1.5 cm at 2450 MHz (about 2.5 cm at 900 MHz), which means that the absorption is very superficial. The main absorption mechanism is fieldinduced rotation of polar molecules (for example H2O), which generates heat through molecular "friction".
http://www.swedetrack.com/images/bluet05.htm
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