Descriptive ethics will hence try to oversee whether ethics still holds its place. Because descriptive ethics involves empirical investigation, it is a field that is usually investigated by those working in the fields of evolutionary biology, psychology, sociology or anthropology. Information that comes from descriptive ethics is, however, also used in philosophical arguments.
To deactivate an ICD or alter pacemaker function, a magnet has to have a field strength of 10 gauss (a unit of magnetic strength) or greater next to the surface of the device. A magnet in a stereo speaker has a field strength of 100 gauss at the surface - but 0 gauss 6 inches away.
Sources include this report on pacemakers and music players from Boston Scientific, one of the major manufacturers of pacemakers. They say, As described in the pacemaker and defibrillator instructions for use, exposure to strong magnetic fields >10 gauss (1 mTesla) may alter implanted device function.. When we contacted them, the folks at Boston Scientific confirmed the 10 gauss figure.