[Behavior Training] This dog repeller can train your dog's behavior. When your dog exhibits unwanted behaviors such as biting things or jumping on people, you can use the ultrasonic waves for training and correction. [Three Adjustable Ultrasonic Waves] This ultrasonic dog repeller has three adjustable frequencies. The sound waves with safe frequencies will not harm your dog. You can increase the intensity of the sound waves to stop barking and drive away aggressive dogs, or decrease the intensity of the sound waves to train your dog. [LED Flashlight] This dog repeller features an LED lighting design, equipped with two loud LEDs. A simple press turns on the light, ensuring your safety even when walking in the dark. [Wide Use] This dog repeller is suitable for various indoor and outdoor places. When there is a dog near your home that often barks at night, you can silence it; or when you encounter a group of barking dogs incessantly in the park, you can disperse them. [Easy to Use] This ultrasonic dog repeller is easy to use, with just a few simple buttons, such as an on/off button, a speed adjustment button, etc. Even in emergencies, you can react quickly and use the dog repeller effectively.