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Current FCC regulations limit power output to 1 Watt EIRP (Effective Isotropic Radiated Power) for 802.11b (2.4GHz) devices. Most cards are 30 milliwatt, and there are a few 100mW and 200mW cards out there. Compare this with microwave ovens, which can emit 500 to 700 Watts to heat up your dinner. Of course, microwave ovens are shielded, but even a small amount of leakage would emit more radiation than these 802.11 devices.
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