Feature: 1. The range of action is large, and it can be effectively driven around 15 meters, which is convenient and quick. 2. Unlike other electric shock dog training tools, the ultrasonic anti-barking device uses the latest ultrasonic technology. This sound does not affect humans, but it can easily grab the dog's attention and drive away. 3. Effective bark control device, ultrasonic bark control device provides a safe and effective solution. 4. It can help the owner control unwelcome dog barking and prevent some bad behaviors of the dog, such as excessive barking, burrowing, chasing, eating dirty things or fighting. 5. Comes with USB charging cable, supports USB charging, built-in battery, which is highly practical. Specification: Item Type: Ultrasonic Dog Bark Stop Device Material: ABS Product Size: Approx. 12.5x5x2.5cm/4.9x1.9x0.9in Performance Battery: Polymer lithium battery 950mAh (included) Power: 1-3W Frequency: 25KHZ Operating Voltage: 3.7V Charging Voltage: DC5V How to Use: 1. Illumination: Turn the gear selector switch under the product to the "light" position, and it can be used as a flashlight. 2. Dog Training: Turn the gear selector switch at the bottom of the product to the "I" position, press the button on the top of the product to switch the machine to emit ultrasound, and you can train the dog at this time. 3. Dog Driving: Turn the gear selector switch at the bottom of the product to the "II" position, press the button switch at the top of the product and use it against the dog, and the dog will run away every day. Principle of Ultrasonic Dog Driving: This product is mainly used in outdoor environments to prevent being attacked by dogs. When you encounter a dog that tries to attack you, you will take out this "enhanced repellent" to drive the dog with ultrasonic waves. Ultrasound is very stimulating to the dog’s hearing. The large, super bright LED flashing can also make the dog know the location of the sound source, so as to understand that you are targeting it with a weapon in your hand. The longer you stay in this position, the greater the stimulation to it, and it will go away rampantly!. Package List: 1 x Ultrasonic Dog Bark Stop Device1 x Manual1 x USB Cable Note: Keep children away from playing it.