Anti Barking Device,Ultrasonic Dog Bark Control Devices 50FT Range Outdoor Indoor, Stop Barking Dog Deterrent Devices 4 Modes Bark Box Dogs Sonic Sound Silencer Safe for Human & Dogs

• Dog Barking Control & Stop Your Daily Nightmares - Our dog bark control devices are effective in stop neighbors dog from barking, thus saving you and your neighbors from the pain of noise. The ultrasonic waves emitted by the anti bark control 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 Adjustable Modes & Range Up to 50 Feet-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. Test mode; 1=Low range: up to 15 feet; 2=Medium range: up to 30 feet; 3=High range: up to 50 feet. It’ll take 2 weeks for some barkers to learn the power of anti-barking devices.
• Small & Safe No Bark Control Devices - The sonic bark deterrents dog silencer 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 you may not even hear it! This bark deterrent device is safe for small, medium and large dogs. Train your dog to stop barking in a professional manner and develop good behavior.
• Waterproof & Durable Outdoor Bark Deterrent Tool - This mini anti-bark dog training equipment 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.
• YMSXHY User Guide & Sincere Service -This ultrasonic dog bark box is simple to set up and easy to use. The effectiveness of this device depends on proper use. Please know that the 9V battery is not included in the box. If you encounter any obstacles in the process of use, or the anti-barking effect is not satisfactory, please be sure to contact us, we will be happy to help you solve the problem.

Source reference: https://www.amazon.com/dp/B0BMB2CBD6