No more annoying barking This barking deterrent uses ultrasound to effectively train your dog to stop excessive, loud barking. Suitable for dogs of all sizes and breeds. Class 3 Ultrasonic and 50 Feet Effective Range With built-in microphone and Class 3 ultrasonic strength, it can detect dog barking from up to 50 feet away.Please use test mode to verify that the microphone and speakers are working properly. Safe material for humans and pets We can't hear low-intensity ultrasound, it's only suitable for dogs, convenient and harmless. You can enjoy quiet nights with this anti-bark device.Effective for most dogs Suitable for dogs of all breeds and sizes, but not for dogs with hearing loss or hearing loss. Turn on outdoor bark control only when you bark unnecessarily to prevent your dog from becoming desensitized.Cute Appearance This birdhouse-shaped sonic bark deterrent can be mounted on a tree, wall or fence to keep your own dog or your neighbor's dog from barking. Make sure the microphone is less than 5 feet high and facing the barking dog.