[Dog barking control] Our ultrasonic barking control device can provide you with better and easier dog training; it can effectively train your dog to stop unwanted behaviors, such as barking, digging, fighting, etc.; keep quiet surroundings [Harmless to dogs and people] This ultrasonic anti-barking device can emit ultrasonic waves that can be heard by dogs. It is just a harsh noise for dogs and harmless to dogs and people; keep dogs quiet in public places Durable and waterproofSmall and lightweight, you can carry it with you when you are outdoors; it is waterproof and can be easily hung on a tree, anywhere in the house or in the yard; it can be hung, placed on a table or other places at will [3 frequency levels] With 3 ultrasonic frequency levels, it can be used for different kinds of dogs; 15KHz-30KHz, high sensitivity, suitable for large dogs, such as hunting dogs; 20KHz, medium sensitivity, suitable for docile dogs; 30KHz, low sensitivity, Suitable for small dogs [Reminder] This anti-barking device is not suitable for the following situations: aggressive dogs, noisy environments, hearing-impaired dogs, multiple dogs together, dogs under 6 months or dogs over 8 years old; preferably every time Train a dog Product Description instruction: Do you want to rest quietly without disturbing dog barking? Don't you wake up in the middle of the night because of dog barking? Our bark control device may be your first choice. With this device, it can safely and effectively reduce annoying sounds, maintain a quiet environment when you really need to rest, stop barking in the middle of the night, and maintain good neighbor relationships. We are committed to providing customers with a good shopping experience. If you have any questions about our products, please feel free to contact us. We also provide refund or replacement services to our customers within 60 days. Don't worry that this anti-barking device will harm cute dogs, it is very friendly to them. usage: 1. Hang or install this barking control device on a tree, wall or fence to prevent your own dog or neighbors dog from barking. 2. Make sure the microphone is less than 5 feet tall and facing the direction of the barking dog 3. When the dog barks, it will automatically be activated. Warm suggestions: 1. Please use this device for dogs between 6 months and 8 years old. 2. Do not use this device with violent and aggressive dogs and hearing impaired dogs. 3. Please bring only one dog to use this equipment during training. 4. Please check the battery level every month, if the battery level is too low, please use the USB cable to charge. 5. Red/blue indicates the battery status. 6. It is best to try different frequencies to get the most effective frequency for the dog. Level 3 operation mode: -Low range: up to 15 feet -Middle distance: up to 30 feet -High range: up to 50 feet