Feature: SAFE ANTI-BARKING DEVICE - Emits an ultrasonic 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 - Fits for nearly all small or big dog (without hearing impairment from 6 months to 8 years old)by adjust 3 levels frequency of 15KHz-20KHz-30KHz. DURABLE AND WATERPROOF - lightweight, waterproof material, ABS 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 50-INCH EFFECTIVE RANGE - outdoor Bark Control can automatically detect dog barking up to 50 feet away (also works on your neighbors dogs ). LONG BATTERY ENDURANCE - Working for 30 days by fully charged for 5 hours.(with red/blue battery indicator light) How the Outdoor Bark Control Works When the Ultrasonic Dog Bark Deterrent is within range of a barking dog,an internal microphone pick up the sound and the unit is automatically activated. The Ultrasonic Dog Bark Deterrent emits an ultrasonic sound. The sound can be heard by dogs25KHZbut does not affect humans (audibility limit of 20KHZ) Startled by the high-pitched sound that is safe and effective,the dog should stop barking, which is harmless for both your dogs and your family. it will help human to keep away from unwanted barking. When the dog stops barking the ultrasonic sound also stops. The Ultrasonic Dog Bark Deterrent has 3 range levels and a test mode.It is effective up to 50 feet. Possible use for the Outdoor bark control: Stop your barking dog Stop your neighbors' barking dog Train puppies not to bark Deter barking dogs on camping trips Package Includes: 1* Anti Bark Device 1* USB Cable 2* Mouting Screw 2* Mouting Anchors 1* User Maual