battery not included Principle: The range of sound waves that humans and animals can hear are different. Our dog repeller uses this principle to emit sound waves that only dogs can hear, but humans cannot. This sound doesn’t affect humans, but can appeal to dogs. Pay attention to and prevent their bad behavior, so as to achieve the effect of driving dogs and stopping barking. Dog Repellent: Our dog repellent sticks make harsh waves, which are annoying to dogs. It drives away unfriendly dogs and protects itself from bad dogs while walking, jogging or biking. Our products physically stimulate the dog without harming the dog or affecting the dog’s health. Dog training: Our products can effectively stimulate the dog’s nervous system to stop barking, digging, fighting, chewing furniture, eating unsafe food and other bad behaviors under the guidance of the owner. Suitable for training all kinds of dogs, such as pets, police dogs and sheepdogs. Lighting: Our dog repellers also feature