This ultrasonic device trains dogs to walk without tugging their owner. The device attaches between the leash and collar (neither included) and when the dog tugs, the integrated speaker emits a harmless ultrasonic tone that canines find irritating yet is inaudible to humans. The ultrasonic tone becomes louder the more often the dog tugs. The dog associates the unpleasant sound with pulling on the leash, thereby learning to walk properly. The tone is directed into the leashed pet so as to not disturb other pets and the four volume levels can be adjusted manually to accommodate dogs with different levels of sensitivity. The device can be removed from the leash and used as a handheld device to teach dogs to sit, stay, and heel. Compatible with any leash and suitable for all dog breeds and sizes. Requires a 9-volt battery. 6 1/2" L x 1 1/2" W x 1" D. (4 oz.)