2-in-1 Dog Trainer: Deterrent Mode: emits a higher intensity ultrasound as a warning when the flashlight flashes to prevent other dogs from approaching you. Training Mode: Send out low-intensity ultrasound to assist dogs in daily training, such as stopping excessive barking, fighting, biting, and correcting other bad behaviorsPowerful Dual Ultrasonic Speakers: The dog training and barking control device UT01 uses two speakers up to 25 feet to deter unfriendly dogs.Portable Design: Makes the pet gentle bark protector suitable for indoor or outdoor use. You can use an ultrasonic bark deterrent to train your dog or take it with you to drive away. High-frequency strobe lights combined with ultrasound for added deterrence, especially at night or in dim environmentsCorrecting Bad Behavior: The Ultrasonic Dog Barking Deterrent UT01 emits 25 KHZ ultrasonic waves, which will not affect humans, but can attract the attention of dogs without causing harm. When the dog stops misbehaving, give the dog food, threats, or petting to enhance the training.Occasion: The ultrasonic dog trainer is a pet-safe and efficient dog training tool, with two modes, suitable for various scenarios.