20 ms·

What about bluetooth headphones?

• garganzol 9y ago
  Bluetooth radiation is considerably less powerful than cell network or WiFi signals. Most headphones belong to Bluetooth Class 2 which limits the maximum output power to 2,5 mW (4 dBm). 2.5 mW is pretty safe even in a close contact with the body. Saying that, I would still recommend to minimize the exposure. The less 2-10 GHz radiation you get, the better your health is.
  • GeorgeTirebiter 9y ago
    Look at the graph in http://www.arrl.org/files/file/Technology/tis/info/pdf/hbkrf.pdf http://www.arrl.org/files/file/Technology/tis/info/pdf/hbkrf... You can see that the worst frequency range is 30 to 300 MHz meaning that range has the lowest acceptable power levels that are considered safe. The entire short article is quite good.
    • Johnythree 9y ago
      But the article explains that is only for Thermal effects, and that there is no correlation with cancer risk. And that any power level below 7 Watt (eg any mobile phone) is completely exempt.