You've decided this is the career path for you. You get all sorts of perks and it pays very well! That's all well and good, but oh no! Some measly do-gooder is trying to overthrow your master plan! What kind of stuff would you do to stop this situation? I would not use a device with a digital countdown for my plan. Otherwise this would give the hero time to stop me. Similarly, I would make the activation method to the device wireless, so the hero cannot cut the wires to prevent my plan.