Descriptions: This product is mainly used to prevent attacks by aggresive dogs when going out. When you encounter a dog that is trying to attack you, use this product to the dog. The 125 dB ultrasound is a great stimulus to the dog. So it will get frightened and hurriedly fled. Features: 1. This ultrasonic dog chaser emits strong ultrasound (ultrasonic waves). Under proper operation, only animals will hear it, and humans will not hear it. 2. The energy of the ultrasonic wave is about 125dB/30cm, causing uncomfortable and unbearable interference to the animal, and this harsh sound will be more serious when the animal approaches. 3. Easy to operate, point the horn towards the approaching animals, and press the switch button continuously for 2~3 seconds to make animals realize this uncomfortable sound wave. 4. Since the output sound wave will decrement when it deviates, switching the directions of the dog chaser continuously will do a better effect. 5. Ideal for outdoor travel, bicycles, self-driving travel, and those who hate to be harassed by dogs. Specification: Product size: 130 x 40 x 25mm/5.12 x 1.57 x 0.98" Effective distance: 10 meters Power supply: 9V battery (not included) Notes: 1. Do not use it to home pet to avoid causing discomfort. 2. Do not press the button for a long time to avoid overheating of the ultrasonic speaker. 3. Do not use this product after infuriating the dog, which is a cruel behavior. 4. Children must use it under the correct guidance of adults. 5. Do not use it near ears. 6. Please install a new or fully charged battery. 7. Effective distance: 10 meters 8. Powered by 9V battery (not included) 9. Only when the button is pressed will the LED indicator light up. 10. When the ambient noise is large, the use effect will get weak. 11. The use effect will get weak for some pets born deaf. 12. Please refer to the product manual for details.