[Safe and Effective Anti Barking Device] The upgraded dual-frequency ultrasound combines fixed and variable frequencies, allowing it to be used on a wider range of dog breeds and can stop barking more effectively. The anti barking device for dogs can also help you train your dog and correct bad behavior such as endless barking, digging, chewing furniture, eating unsafe food and fighting. [Easy to Use Bark Stopper]You just need to press the button and then when you hear the beep, it indicates that the dog barking deterrent devices is sending ultrasonic waves to your dog to alert him to stop barking. Ongoing training provides effective and long-lasting results. [Handheld and Portable Design]The pet gentle anti barking device is compact and portable. Easy to carry when you are walking your dog, walking or running. The effective range is 16.4ft, perfect for training your dog at home or outdoors. It can also prevent other dogs from approaching you while jogging, walking or running. [Ultrasound Specifically Designed for Dogs]The average human hearing frequency range is 20HZ-20KHZ, dogs can hear a wider range from 15HZ to 120KHZ. This ultrasonic dog barking device emits a 24KHZ-30KHZ frequency conversion ultrasound. Therefore the sound will not affect humans but will attract the dog's attention and make the dog learn to stop barking. Colour: Black Size: 4.5*10.5*3.3cm Delivery Quantity: 1 Piece