Dog Bark Control and Dog Training - Our 2-in-1 ultrasonic anti-bark device provides a safe and effective solution for dog training and bark control. The anti-bark device can effectively train your dogs to stop unwanted behaviors such as barking, digging, eating unsafe food, fighting, etc. Safe and Suitable for All Sizes of Dogs - The average hearing frequency for dogs ranges 15HZ to 120KHZ. The ultrasonic bark control emits ultrasonic sound at 25KHZ, ensures the sound can grab the dog's attention but will not hurt the hearing of humans and dog. The barking control device can be applied to all-breed dogs and all size dogs. 16.4ft Control Range, Indoor and Outdoor - This ultrasonic bark deterrent has 16.4ft effective control range, which is longer than the normal range 6ft. And its portable design makes it suitable to be used indoor or outdoor. You can use it to train your own dog, or you can carry it around to drive away unfriendly dogs you encounter on the road. No Skills Required, Simply Press The Button - The dog training device fits perfectly in your hand. No skills required, simply press and hold the button, the bark deterrent will emit an ultrasonic sound to attract the dog’s attention. The LED light on top of the button can indicate working status and low power mode. Friendly Note - This anti barking device doesn't work on dogs who are hearing impaired. We recommend using this product on dogs above 6 months and under 8 years. Also, at the beginning of use, the dog needs close observation and companionship. If you want to achieve long-lasting result, please be patient and consistently use the product as a training aid, along with commands and positive reinforcement.