The Pro-Trialler whistle is designed for professional use, maintaining a steady frequency regardless of the force applied. It offers moderate sound intensity, very close to human hearing, making it suitable for dog training programs.

Features:

• Stable frequency regardless of the applied pressure.
• Less confusion for the dog, especially at long distances.
• Ideal for training dogs such as Pointer, Setter, Retriever, Labrador, and Terrier.
• Suitable for dogs that require more challenging training.