Category	Action	Explanation  Category 1 Switch off all devices. This is the safest category. Any device that is switched off is not transmitting and therefore the safest. This is not  necessarily the most practical, but basically when you are not using your devices like mobile phones, WIFI router or  tablet - switch it off. Category 2 Add distance between yourself and the transmitting device. Field strength drops off rapidly with increased distance. For every one unit of distance you add, field strength  drops off twice as much. Category 3 Shielding products like RF blocking paint or RF blocking window film or curtains reduce EM penetration by up to  98 percent. Install shielding products which either absorb and neutralise the EM field, or bounce (reflect) it away.
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