The Company of Animals Clix No-Bark Collar is the safe, humane way to teach your dog not to bark. A built-in microphone detects barking and instantly interrupts it with either a sound or vibration. These low-cost bark collars provide effective, efficient training, without the use of sprays or painful electric shocks Stops dogs from barking using sound or vibration.No sprays or electric shocks.Fully adjustable for a comfortable fit.