[Effective Dog Barking Control]- Newly upgraded chip that stops excessive and loud dog barking by emitting ultrasonic sound to silence the dog. More effective than old versions deterrents and waterproof. [4 Adjustable Sensitivity] - The anti-barking device has 3 range levels and a test mode. Including: Low sensitivity (15ft), Medium sensitivity (30ft), High sensitivity (50ft). You can use the test mode to check if the microphone and speaker are working properly. [100% Harmless] - It emits high-frequency ultrasound to make the dog uncomfortable and stops barking instead of hurting it, no effect on the dog's health. And is completely inaudible to humans, so it is absolutely safe. [Waterproof and Durable] - The barking device designed for outdoor use is made of high-quality waterproof material. Whether it is a sunny or rainy day, just turn on the switch and you will not have the trouble of barking. On the other hand, it will also be a good assistant for training your dog. [Effective for Most Dogs] - Suitable for dogs of all breeds and sizes, but not for dogs with hearing or speech impairments. Open the bark control only during unnecessary barking to prevent the dog from becoming insensitive. Powered by 9V battery operation (NOT INCLUDED). Usage Issues Not recommended: 1. The anti-bark device will not work for hearing-impaired dogs or aggressive dogs. 2. Not recommended for dogs under 6 months and over 8 years old. 3. It is not recommended to use a single device against two or more barking dogs at the same time. Warm Tips: 1. Make sure the bark controller is in front of the dog within unobstructed range. 2. The maximum detection range is 15 meters, the bark stopper will not be activated to work by dog barking if it is outside this range. 3. It is not recommended to use the same ultrasonic frequency on the same dog for 10 days or more. The dog may have resistance to the same frequency. Please change the frequency every 7-10 days. Specifications: Material: ABS. Product Dimensions: 15.2 x 10 x 10 cm. Package Contents: 1 x Ultrasonic Controller. There is no 9V battery in the package, the battery needs to be purchased separately.Good quality product