1. Dog Whistles Our dog whistles are welldesigned and compact, making them easy to carry. Ideal for dog training, this set includes a black whistle and a white whistle, along with two lanyards to prevent loss effectively. 2. Material The dog whistle is crafted from stainless steel, ensuring sturdiness, durability, and rust resistance. It features a metal key ring for attaching to the included nylon lanyard. The ABS plastic cover protects the inner structure. 3. Wide Compatibility Our dog whistle suits all breeds, including Labradors, Shepherds, Rottweilers, Dachshunds, Huskies, and more. The ultrasonic waves effectively capture your dog's attention, helping them obey commands and master basic behavioral skills. 4. Adjustable Frequency Different dogs respond to different frequencies. Our whistle comes with a nut and screw for frequency adjustment—simply turn to find the setting. Observe your dog's reactions to each adjustment until you identify the strongest response.