This training system takes advantage of your pet's sensitive hearing with a sound that is beyond the range of humans. When the system emits its ultrasonic sound, your furry friend will understand that you want him to stop whatever he is doing. The system also has a positive tone to reward good behaviors as well as a negative tone to counter undesirable ones. The system works on dogs of any size and has a range up to 30 feet with both positive and negative tones for added training flexibility and a Good/Low battery indicator.
* Remote uses 9-Volt alkaline battery
Write Your Own Pet Safe Collarless Ultrasonic Remote Trainer Review