BARKING DEVICE - Emits an sonic sound that distracts your dog to interrupt a constant barking pattern. Harmless and humane way to keep your dog or your neighbor's dog from unwanted barking! It can keep you away from the trouble of dog barking and provide you a quiet and comfortable rest and sleep environment. ADJESTABLE MODES - control device has 3 different sensitivity settings. We recommend you to start with 15KHz and increase power as needed. This product fit for different breeds of dogs.But only work with dogs which have normal hearing from 6 months to 8 years old. Use Area - lightweight, waterproof material, plastic It can hang on the tree, fence and so on for outdoor. Whether it is a sunny or rainy day, just turn on the switch and you will not get the trouble of barking. Service Range-Barking control device can automatically detect the barking of dogs 50 feet away. Then, the dog barking control device will automatically emit ultrasonic waves that only dogs can hear. After the dog stops barking, the device will automatically stop sending ultrasound. If the barking of the neighbor's dog disturbs your life, and the distance is more than 50ft, please buy a few more, put one per 50ft, the effect will be better. LONG BATTERY ENDURANCE - Working for 30 days by fully charged for 5 hours.(with red/blue battery indicator light) When the product is turned on, it will flash once every six seconds when in any gear. The light is not always on. Material:plastic colour:Black white Package Contents: 1 * USB cable 1 * Barking Device Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.