Pet Friendly Bark Control Device: The automatic bark stop device uses the latest ultrasonic technology and is suitable for all breeds and most sizes of dogs. Quiet your dog by emitting ultrasonic waves to stop excessive, loud dog barking. The anti-barking device has three adjustable ultrasonic volumes, low, medium and high, please turn the knob to test different frequency bands to get the best effect.30ft Dog Barking Deterrent Range: Ultrasonic anti-barking device, 3 distance range up to 3ft. Simply place this dog barking control machine in any outdoor setting where excessive barking may occur. The unit will automatically detect your dog's barking and emit a safe ultrasonic sound that only dogs can hear to deter and train your or your neighbor's dog to stop barking! No more doorbells!Outdoor and Indoor Use: The humanized bark stopper has IP4 rainproof function and portable hook, suitable for outdoor use, easy to hang on trees, walls or fence posts. This ultrasonic dog barking control device can save space or be placed on indoor tables, walls and shelves up to 1.5 meters high, which can avoid barking, digging, fighting, etc. more effectively. Our anti-bark devices can be set up outside to deter homeless dogs from barking.Note:1. Please allow a little error due to manual measurement. Please make sure you don't mind before bidding.2. The color may vary due to different monitors, please understand.Note:Hello, please pay attention to your delivery address when purchasing products. If your receiving information (such as: name, street, house number, doorbell/email without name, etc. is incorrect, the order will not be delivered correctly.)