Two-in-one dog trainer: Deterrent Mode: High-intensity ultrasonic waves flash as a warning to prevent other dogs from approaching. Training Mode: Low-intensity ultrasonic waves are emitted to assist with daily dog ​​training, such as deterring excessive barking, fighting, biting, and correcting other undesirable behaviors. Powerful Dual Ultrasonic Speakers: The UT01 dog training and barking control device uses two speakers with a maximum output of up to 25 feet (approximately 7.6 meters) to deter unfriendly dogs. Portable Design: This gentle barking deterrent for pets is suitable for indoor or outdoor use. You can use the ultrasonic bark deterrent to train your dog or take it out for a walk. The high-frequency strobe light combined with the ultrasonic waves enhances deterrence, especially at night or in dimly lit environments. Correcting Undesirable Behavior: The UT01 ultrasonic bark deterrent emits 25 kHz ultrasonic waves that are harmless to humans but attract a dog's attention without causing harm. When the dog stops the inappropriate behavior, give it treats, threats, or petting to reinforce the training. Application: The Ultrasonic Dog Trainer is a pet-safe and effective dog training tool with two modes for various scenarios. Package Included: 1 x Dog Trainer (Dual Head and Battery)