Bluetooth is a method for datacommunication that uses short-range radiolinks to replace cables between cellphones, computers and their connected devices. It uses the microwave radio frequency spectrum in the 2.4 GHz to 2.4835 GHz range. Maximum power output from a Bluetooth radio is: 100 mW for Class 1 devices (approx.100m range) 2.5 mW for Class 2 devices (approx.10m range) 1 mW for Class 3 devices (approx.1m range) According to studies, Class 1 is at roughly the same level as cellphone's SAR (Specific Absorption Rate) Rating.
, the other two classes much lower and considered less of a potential hazard than cellphones. For your info, SAR is a measure of the rate at which energy is absorbed by the body when exposed to a radio frequency (RF) electromagnetic field. The safety SAR for human body or head to withstand the RF electromagnetic field generated by cellphone is about 2~3 mW.
Although the cellphones nowaday have very low SAR, the Bluetooth devices such as Bluetooth handfree headset, are actually helping individuals to keep a distance between their head to the cellphone when they are talking, by cutting the wire and transfer soundwave through bluetooth link, and eliminate the possibility of getting too much RF generated from the cellphone when calling. So we can say they is no health risks of wearing a Bluetooth headset all day long, not to mention when you are driving, it keep your hands on the wheel too.
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