Used to prevent attacks, issue ultrasound to repel the or wild wolf. Effectively target animals up to 20m away.Can also be used as training device. drive unit, the appearance design is exquisite, easy to carry, especially suitable for outdoor work, outdoor travel and night patrol，Only for small dogs. In normal situation, it can be used as a normal to illuminate at night.Ultrasonic wave reaches up to 125db. Audible to dogs but not to human. This product adopts double channel enhanced, double training, excitation drive dogs, liting function is one of the super ultrasonic.