Safe Barking StopperThis ultrasonic anti dog barking device uses high-pitched ultrasonic technology that is harmless to pets and completely inaudible to the human ear. If the dog is hearing-impaired or aggressive, the device may not work as expected. Using one device against two or more barking dogs at once is not recommended. Auto Anti Dog Barking DeviceCompared with the traditional dog training device, Feria dog barking stopper intelligently captures dog bark as far away as 50 feet, and automatically emits an ultrasonic sound that distracts your dog to stop unwanted barking, let you enjoy a moment of peace and silence. Easy Installation & WaterproofThe dog barking deterrent is designed for easy hanging or mounting on a tree,wall or fence post to keep your own dog or your neighbors' dog from barking. IPX4 waterproof level allows the anti barking device to be used indoors and outdoors in different weather conditions. You can put or hung the bark device anywhere you want. Rechargeable & DurableThe ultrasonic stop dog barking device is designed with a rechargeable USB power cord that can be contiguous work for 30 days after 5 hours of full charge. With low battery power indication guarantee you charge in time. The sturdy ABS IPX4 waterproof shell gives the device a longer lifetime and can be put or hanged everywhere indoor and outdoor.