if i were to use one, i would have to ask them how to! we have some devices we put on our cell phones i think we got from dr. mercola to help with the radiation. we keep computer monitors at a distance and do not watch television, (we don't have one) so minimize our EMF exposure. one of the worst and most dangerous items is sleeping next to a digital alarm clock. there is a device that is very affordable you can find on the net called a Gauss Meter which measures the output of electro magentic frequencies. you should check if the back of the refridge is close to a wall that you sit by, things like that.