Features: If you encounter a dog, press the button. The loudspeaker will emit ultrasonic waves. This sound can only be heard by dogs, but not by humans. This makes the dog very uncomfortable and leaves quickly. This version of the dog training equipment has recently been improved with a 2-level setting the dog barks immediately press the button to start from a safe and effective high pitch, the dog will stop barking because it will combine its bark with this unpleasant noise Connect. After a few repetitions, the dog will know that its barking will bring discomfort to itself. This will gradually reduce unwanted barking. When your pet is disobedient, you will feel scared when you press the button, and then teach it to specify the action, and then you can repeat this principle to teach him different actions to achieve When your pet is disobedient, you will feel scared when you press the button, and then teach it to specify the action then you can repeat this principle to teach him different actions to achieve the purpose of dog training. Exquisite and compact, easy to carry, streamlined design, small and portable, ultra-light body, easy to use for adults and children. Suitable for multiple dog breeds, as long as the dog is older than 6 months and has normal hearing, this device can be used. One charge, lasting 15 days. Specifications: Product material: ABS+PC Work side view: Ultrasonic frequency conversion Battery capacity: 1200 mA Product rated power: 3W Ultrasonic radiation power: 24KHZ color：black, for grey Size: 10x4.5x3.3cm/3.93 x 1.77 x 1.29in Package Includes: 1 set ultrasonic dog training device note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.