Safe Anti Barking Device - Ultrasonic frequency is harmless to pets and has no effect on human ears, but dogs are sensitive to these ultrasonic waves. A humane sonic deterrent and a professional way to train your dog to stop barking with this home dog barking control devices for barking dogs. 3 Adjustable Ultrasonic Control - Suitable for small medium large dogs! Dog barking control devices has four adjustable ultrasonic volume levels: test, low, medium and high. You can turn the knob to test different frequency bands for the best results. But some dogs may be afraid or dislike the sonic sound, not stop barking at the beginning, so please allow up to 2 weeks anti barking device for training. 50-FT Effective Range - Dog barking control devices is automatically activated when it detects barks up to 50 feet away. Anti barking device can be hung on a tree, indoor, outdoor wall or fence post to stop dogs barking. Stop barking and stop your neighbor's dog from barking now with this advanced barking control devices. Unique Birdhouse Design - The designer chose ABS plastic from a variety of materials for anti barking device, which is very shattering resistant. The Dog barking control devices interior is also installed with fixed devices, and lightweight, super cute design, suitable for outdoor decoration. The dog barking deterrent can be easily mounted on a tree, wall or railing and will effectively stop any barking. Durable &Weatherproof - Dog barking control devices anti-smashing, durable, weatherproof, sturdy bark box bark control, lightweight, waterproof material. Anti barking device can with stand any weather conditions . Excellent outdoor dog barking deterrent. Warm Tips for Use - The anti barking device is not suitable for the following situations: aggressive dogs, noisy environments, hearing-impaired dogs, dogs under 6 months or over 8 years old.