Dogtra Yapper Stopper - YS300 - No Bark CollarThe Dogtra Yapper Stopper YS300 No Bark Collar is perfect for small to medium sensitive breeds. With its innovative sound recognition and filtering micro processor, it can differentiate your dog's barking from other noises in the environment. This intelligent collar utilizes self activating sound analysis technology, ensuring that it only responds to your dog's barking. Features: 7 intensity levels for a wide variety of dispositions. Level "P" emits