Color: mainly silver Material: durable nickelplated brass Length: about 55 cm Key benefits Adjustable pitch to match your dog's response: simply tighten or loosen the screw to set the frequency for effective training. Twopart sound design: an ultrasonic signal audible to dogs (not to most humans) paired with a light audible tone for the trainer to gauge and cue long or short whistles. Humanaudible cue for efficiency: the whistle can be heard by the trainer, making it easier to assess performance and adjust technique in real time. Durable construction: nickelplated brass is built for regular outdoor use and years of training sessions. Easy to use: straightforward adjustment and hold for comfortable extended training. What it does Provides a controllable training signal that helps improve recall, obedience, and behavior in dogs. Lets you train with clear, repeatable cues in a variety of environments, from backyards to parks. How it works Adjustable pitch: use the screw to tighten or loosen and set the dog's frequency to suit the individual dog. Two sound components: a dogfocused ultrasonic signal for effective training, plus a humanaudible tone to monitor and cue the session. The whistle is audible to the human ear, which helps you gauge its efficiency and consistency during training. Usage scenarios Basic recall training outdoors: use the adjustable pitch to find a frequency your dog responds to in open spaces with distractions. Barking control and obedience reinforcement during walks: use the audible cue to gain attention and redirection, then reinforce with the ultrasonic signal. Group or multidog training: the pitch to suit different dogs in the same session, enabling simultaneous practice with individualized signals. Care and maintenance Wipe clean after use; keep the adjustment screw of dirt and debris to maintain smooth tuning. Store in a dry place when not in use to preserve the nickelplated brass finish.