This is the patented collar that detects a dog's nuisance barking and immediately responds with a harmless static correction. The collar is intended for use in situations where you want to discourage your dog from barking excessively, such as when strangers visit or when you go for a walk. It has sound and vibration sensors that accurately determine when your dog vocalizes, preventing other dogs or ambient noises from inadvertently triggering the device. It then instantly delivers a small static correction that quickly teaches the canine to stay quiet whenever he is wearing this collar. Results can be seen with most dogs after just a week or two of training with no long-term adverse effects. The collar has three sensitivity levels, a test mode, and an LED battery indicator. The durable waterproof collar can be used indoors or outdoors. The included battery lasts up to six months. For dogs 8 lbs. and up. 30 1/2" L x 3/4" W x 2" D. (10 oz.)