EASY TO USE: The anti bark device can be used right out of the box and can be placed directly on the table or other platforms. It can also be installed on the wall or tree through the mounting holes on the back of the product. The bark control device is equipped with a USB charger, which is rechargeable and can be used continuously for 30 days when fully charged, eliminating the waste and trouble of replacing the battery. UNIVERSAL FOR INDOOR AND OUTDOOR USE: After testing, this anti bark device has a good anti-barking effect within 33 feet and can be used indoors and outdoors. The dog barking deterrent is IPX4 waterproof, and the casing is made of high-quality ABS material, which is anti-corrosion, dust-proof and waterproof. Therefore, you can install this ultrasonic dog bark deterrent outdoors to stop stray dogs or stop neighbor dogs from barking. You don’t have to worry about rain, snow or other bad weather. may cause damage to the anti bark device. SUITABLE FOR ALL DOGS: The anti bark device is specially designed for dogs. It combines the hearing band frequency range of all dogs, uses the latest ultrasonic technology, and designs 3 ultrasonic frequencies suitable for dogs, taking turns between the 3 frequency bands. Use this method to prevent the dog from becoming less effective in stopping the barking of the bark deterrent after adapting to one of the ultrasonic frequencies. HARMLESS AND SAFE FOR HUMANS: The anti bark device is designed to create a quiet living environment for us. When it stops dogs from barking, there is no irritating smell, no electric shock, no beeping, and it will not cause any harm to dogs. The anti barking device only emits ultrasonic waves when the dog barks. The ultrasonic waves are specially designed according to the dog's hearing range. They are inaudible to humans and have no impact on humans. EASY TO USE: The anti bark device can be used right out of the box and can be placed directly on the table or other platforms. It can also be installed on the wall or tree through the mounting holes on the back of the product. The bark control device is equipped with a USB charger, which is rechargeable and can be used continuously for 30 days when fully charged, eliminating the waste and trouble of replacing the battery.