• Dog repeller using ultrasound from 22 to 25 Khz. • The ultrasounds create a discomfort in dogs, preventing them from approaching. • Three ultrasound power levels: stable, wavering, and irregular frequencies. • Hand-sized and easy to use. • Red light flashes when there is less than 15% power. • Rechargeable with USB (included). • Includes an ultrasound whistle. • Optional alarm sounds, independent of the ultrasounds. • Not recommended for dogs trained to attack, deaf, or older. • Do not use if there are walls, obstacles, or at long distances.