ALEKO's Dog Hunting Training Collar has a built-in inductor and is equipped with a magnetic switch and built-in buzzer. It can be set to eight different "BIB" sounds. To use the collar, place the collar on your dog's neck, and allow your dog to begin it's hunt. When your dog is on the go and moving quickly, the collar emits a short "BIB" sound. When your dog is moving slowly or stopped in place, it is likely that prey has been found. When this occurs, the product will emit urgent and continuous "BIB" sounds. Since our collar can be customized for eight different types of sounds, it is possible to use eight collars to overlap eight dogs, allowing you to control eight dogs at a time.