AUTO ANTI BARKING DEVICES: When the ultrasonic dog bark deterrent device detects a dog barking, anti barking device will emit an uncomfortable ultrasonic wave, and after several repetitions, the intelligent dog will realize that its barking is causing the sound. This will effectively reduce barking and create a quiet and comfortable environment.WATERPROOF DURABLE ANTI BARK BOX :The waterproof bark stopper is IPX4 waterproof rating and can be well adapted to outdoor conditions, whether it is raining or snowing. This is an outdoor and indoor dog bark deterrent devices. The material of the dog bark deterrent devices is also suitable for outdoor use and will not fade and become old due to the changeable environment outdoors. The effective distance of this device is 50 feet, and anti bark device automatically works within this range to prevent the dog from barking.SAFE ULTRASONIC DOG BARKING CONTROL DEVICES: This anti bark device emits an ultrasonic stop that is inaudible to the human ear, is free of restraints and irritation for dogs, and is safe for pets and humans. The anti-barking device has 3 modes, ultrasonic frequency band 15-30KHZ, 20KHZ, 30KHZ, 3 frequency band coverage is suitable for large, small and medium-sized dogs, and is effective for all types of dogs.DOG BARK DETERRENT DEVICES:The small and lightweight dog bark control device can be carried around, easily hung on a tree fence or wall, or directly placed on the table, effectively reducing the barking of your own or your neighbor's dog or stray dog.RECHARGEABLE DOG BARKING DETERRENT: USB Rechargeable bark box with 1500 mah battery for 30 days on a full charge. When receiving the dog anti bark device, it should be fully charged and turned on to start a good life without annoying dog barking around.