Ultrasonic dog deterrent. The ultrasonic device Dazer III is a repellent device for aggressive dogs and it is the improved version 3.0 with double ultrasonic speaker. It is the strongest distributor on the market thanks to the ultrasonic range and dB pressure, which is inaudible to humans. The approximate range is about 10 meters and the maximum intensity of the range at 100% is 6 meters. From now on, you can run, run or bike along the road or mountains without fear of dogs as they do not approach. When you press the ultrasonic button, the device vibrates so we know it works. USB charging has a low battery indicator. Charging can take 30 days. The Dazer III is made of lightweight and impact-resistant material. How to use the Dazer III: Simply press one of the 2 buttons and focus on the dog. At the moment when the dog perceives the waves, it will stop and not approach to avoid contact with the person. Dazer III has 3 options: ultrasound - we can choose 3 types of frequency: stable: waves with 25 kHz frequency to prevent. Irregular: irregular waves from 20 to 25 kHz to repel. Wellig: waves with sturdy tips for dog training. Ultrasonic + Flash Light: We can combine ultrasonic frequencies with flash. Noises annoying sounds for the dog. RECOMMENDATIONS FOR MORE EFFECTIVENESS It only works with one dog, not multiple dogs at the same time. Does not work with dogs that protect homes or herds or are trained to attack. The effect is greater, the younger the dog is. The person must be calm and not run away to prevent him from chasing him.