Unleash the power of effective dog training with these 6 colorful metal ultrasonic whistles. Designed to make dogs stop barking and come to you on command, these professional recall whistles are a must-have for responsible pet owners. The high-frequency sound is inaudible to humans but catches your furry friend's attention instantly. With a range of vibrant colors, these whistles are not only functional but also stylish accessories. Compact and easy to carry, they're perfect for walks, training sessions, or whenever you need to communicate with your canine companion. Upgrade your dog's obedience and strengthen your bond with these reliable training whistles. Dimensions: 2.5 x 0.5 inches each.