Ultrasonic Handheld Dual Channel Anti-Barking Device 3 in 1 Dog Training Tool with LED Flashlight Ultrasonic Dog Repellent: It produces super powerful ultrasonic waves. When the dog hears the sound of the ultrasound, it becomes uncomfortable and keeps away from the person. People can't hear. Dog behavior training: It can safely and effectively stimulate the dog's nervous system, let it be guided by the owner, and have infrared lights, which can let the dog follow, effectively train the dog to stop barking, digging and other bad behaviors, and it is not safe to eat food, fights, etc. Handheld and Portable: Comes with a lanyard, it is convenient for you to carry it with you, such as jogging or walking, cycling, parks, etc. Easy to operate: first open the battery cover, then put in 1 9V battery (not included), turn on the switch, and it will work normally. Can also be used as a flashlight if necessary. Ultrasonic bark protectors are not effective for dogs with hearing problems and we do not recommend using this product on dogs under 6 months as it may disrupt the dog's hearing development. Training is required for efficient and long-lasting use. Dog Repeller Ultrasonic Handheld Dual Channel Anti-Barking 3 in 1 Dog Training Tool with LED Flashlight Specification: < p>Material: ABS Colour: Black Dimensions: 13.5 x 5.5CM (5.3 x 2.16 inches) Battery: 9V battery not included feature: 1. Ultrasonic dog repeller - the average hearing frequency range of humans is 20HZ~20KHZ, and the range that dogs can hear is wider, from 15HZ to 120KHZ. PESTON ultrasonic bark control emits 25KHZ ultrasonic waves, so the sound will not affect humans, but can grab the attention of dogs. 2. Ultrasonic anti-bark device provides a safe and effective solution for dog training and barking control. 3. Can effectively train dogs to stop barking, digging, eating unsafe food, fighting and other bad behaviors. 4. There are infrared lights, you can let the dog follow. 5. SAFE AND HARMFUL: Our anti-barking device will not affect the health of dogs, so it is a humane way to train your dog or protect yourself and your neighbor's pets. Super safe, user friendly and effective dog repeller. 6. Simple operation: slide the function switch onto the light and press the ON button on the top. The first gear is the function of flashlight lighting; the second gear is long press the light. The third gear is ultrasonic and white light flash, which is used to train and drive dogs. packing list: 1 x Dog Repeller Ultrasonic Handheld< /p>