Dog Barking Control & Stop Your Daily Nightmares - Our dog stop dog barking device are effective in stopping neighbors dog from barking, thus saving you and your neighbors from the pain of noise. The 20Khz-25Khz ultrasonic emitted by the stop dog barking device will correct the bad behavior of the dog and no collar is needed. It is safe and useful for all breeds and sizes of dogs. 4 Modes Adjustable & 50FT Range-The ultrasonic dog barking deterrent is designed with multiple convenient settings and a multi-directional microphone to capture dog barking in any direction! Please turn the anti-bark device knob to test different frequency bands for best effect. Itll take 2 weeks for some barkers to learn the power of anti-barking devices. Compact & Safe Bark Stopper - The sonic no bark control device has been tested and proven to be harmless to human, animals and plants. The anti dog bark deterrent make a harmless but effective sound to control excessive barking and human can not hear it! This bark deterrent device is safe for small, medium and large dogs. Train your dog to stop barking in a professional way. Reliable & Durable Outdoor Dog Whistle - This mini no barking device for dogs is easy to hang on trees, walls or fence posts, or you can place it in your garden or next to your dog's kennel. Our bark deterrent works even outdoors on windy and rainy days, but it's best not to leave the battery compartment at the bottom of the deterrent submerged in water, as this may damage the bark control device. User Guide & Sincere Service - This ultrasonic dog bark box is designed for people without dog training skills. With one simple button, it operates easily. The effectiveness of this device depends on proper use. Please know that the 9V battery is NOT included! We will be happy to help you solve any problems in the process of use.