Features: 1. The device has an effective range of up to 15 meters, offering convenient and quick operation. 2. Unlike electric shock-based training tools, this ultra anti-barking device utilizes advanced ultra technology. The sound is inble to humans but effectively captures a dog's attention and deters unwanted behavior. 3. Provides a safe and effective solution for controlling excessive barking. 4. Helps owners manage undesirable dog behaviors such as excessive barking, digging, chasing, eating inappropriate items, or aggression. 5. Includes a USB charging cable and features built-in rechargeable battery for practical, long-term use. Specification: Item Type: Ultra Dog Bark Control Device Material: ABS Product Size: Approx. 12.5x5x2.5cm / 4.9x1.9x0.9in Battery: Polymer lithium battery 950mAh (included) Power: 1-3W Frequency: 25KHz Operating Voltage: 3.7V Charging Voltage: DC 5V How to Use: 1. Illumination: Turn the mode switch to the "light" position to use as a flashlight. 2. Dog Training: Switch to mode "I", then press the top button to emit ultra sound for training purposes. 3. Dog Deterrence: Switch to mode "II", then press the top button to activate enhanced ultra output for deterring dogs. Working Principle: This device is designed for outdoor use to help prevent unwanted dog approaches. When encountering an aggressive dog, activate the device to emit ultra waves. These waves are highly noticeable to dogs due to their sensitive hearing. The bright LED flash helps indicate the sound source, signaling to the dog that it is being targeted. Prolonged exposure increases the deterrent effect, encouraging the dog to leave the area. Package List: 1 x Ultra Dog Bark Control Device 1 x User Manual 1 x USB Charging Cable Note: Keep out of reach of children.