1. Dog Training Whistle This ultrasonic dog whistle is designed to get your dog's attention and assist with basic training. It can be a useful tool for daily dog training and behavior guidance. 2. Adjustable Frequency Different dogs may respond to different frequencies. The screw and nut design allows you to adjust the ultrasonic frequency. You can observe your dog's response to find the suitable setting. 3. Safe & Sturdy Material The training whistle is made of 304 stainless steel, durable and lightweight. It is designed for safe use with most dogs during daily training. 4. Practical Training Tool Ultrasonic sound can carry a long distance. With consistent training, this whistle can help you give commands and guide your dog from a distance, reducing the need for loud shouting. 5. Suitable for Most Dogs This silent training whistle is suitable for most dog breeds. It is a practical accessory for daily training, walking and outdoor use.