PetSafe Ultrasonic Remote Dog Trainer

No collar, no static stimulation—yet this "silent" training device is highly effective! The secret: it uses ultrasonic tones that only dogs can hear to discourage bad behavior and reward good responses. How it works: when your dog is engaged in a negative behavior—say, jumping on a guest—press the "N" button, and your pup hears an unpleasant tone that cues her to stop. Once she does, press the "P" button, and she hears a pleasant tone that tells her she did a good job. For all size dogs. 30-foot range. Uses 1 9-volt battery (included).