Snakes, insects and birds such as geese use the hiss sound to drive off predators, and our domesticated pets have the same sensitivity to this sound. The Pet Corrector emits an inert gas (like fresh air), which mimics this hiss sound to interrupt undesirable behaviour. Situations in which the Pet Corrector can be used will of course vary, though key uses can include unwanted barking, jumping up, stealing food, place avoidance and aggression. Free training guide included.