content: Videos of working EMP gun models exist, with experiments. 1 meter range to work through your computer server room walls, in case you lock yourself out and need to reboot a rack of gear :     https://www.youtube.com/watch?v=pZnzp4ip5lI https://www.invidio.us/watch?v=pZnzp4ip5lI Caution : instead of reboot, may permanently damage a lot of electronic designs.