1. Pet Whistle Made of quality plastic and chromeplated metal, this pet whistle is sturdy and reliable. The ultrasonic frequency is for your dog's hearing, allowing for confident training. 2. Adjustable Frequency Dogs respond differently to various frequencies. By adjusting the nuts and screws, this ultrasonic dog whistle produces different frequencies—the longer the screw, the stronger the sound. It effectively controls barking and obedience, helping you build a strong bond with your furry friend. 3. Ultrasonic Silent Technology Our lownoise, frequency dog whistle uses ultrasonic technology to emit ultralong sound waves. These waves can be heard by dogs up to 3–4 kilometers away but remain undetectable to humans. for obedience training and teaching basic commands like sit, shake, and stay. 4. Portable Design Compact, lightweight, and exquisitely crafted, this whistle takes up minimal space. It can be worn around the neck or carried easily, making it ideal for outdoor dog training.