Take control of your dog's behavior with this versatile set of two professional training whistles. The adjustable frequency allows you to find the perfect pitch that your dog responds to best, making it an effective tool for recall training and addressing unwanted barking. Each set includes both black and white whistles with convenient lanyards for easy carrying during walks or training sessions. These silent whistles are designed to be heard by dogs while remaining virtually inaudible to human ears, making them ideal for use in residential areas. The durable construction ensures long-lasting performance through regular training sessions, while the adjustable feature lets you customize the whistle's output for different breeds and training needs. Perfect for both professional trainers and pet owners looking to enhance their dog's obedience and responsiveness.