
An internal, rechargable, battery operated device for outdoor use in deterring livestock from passing through an open gate in a fence. The device incorporates a detector which senses the body heat of a large approching animal and relays a signal to a special siren, thus producing high intensity ear-splitting sound waves to frighten them away. The sensing mechanism is of the type capable of detecting infrared heat generated by the animal's body. The operating principle of this invention is very s...











