3X Fast, Humane, No Barking: Using triple ultrasonic emitters, this ultrasonic dog training device stops unwanted behaviors like barking, chewing, or biting quickly and effective. The alternating 25kHz fixed and 2229kHz variable frequencies keep dogs from tuning it out. No pain, no harmful Barks no more made easy. For best results, aim the device directly at your dog within 50ft. Ideal for dogs from 6 months to 8 years without hearing impairments: Not recommended for dogs with known neurological disorders, including epilepsy or seizures 5-in-1 Anti Bark Smarter Training for Every Dog: Dogs arent one-size-fits-alland neither is our solution. With five customizable modes, including ultrasonic sound, beeps, and a strobe light, you can tailor training to your dogs temperament. This bark deterrent device works with 97 of dogs and stays completely safe to human ears. No harsh bark collarsjust humanue behavior correction. Please short training sessions and monitor your dogs response. Discontinue use if your dog shows signs of stress or discomfort 50FT Long Range Control Barking at Hand: From the living room to the backyard, this ultrasonic anti barking device works from up to 50 feet away. It's great for stopping your own dogor even your neighborsfrom barking endlessly. The push-button design, beep mode, and light flash make it simple to use anytime, anywhere. Take control and stop neighbors dog barking with ease. Ensure the device has a clear line of sight to the dog and avoid using in areas with obstructions like walls or glass