Sage Square Product Dog Whistle Two-tone Ultrasonic Flute. Silver Color, high quality copper material, small exquisite Durable stainless steel training products for your pet Unique sound and frequency, very suitable for liontamer dog, cooeeing, eagle animal. Function: Training dogs Some tips to use the dog whistle: Adjust the pitch & blow the whistle to your dog. Even dogs can't hear all frequencies. Wait until he is asleep and gently blow on the whistle. Your whistle has a nut and screw that adjust the frequency when turned. Continue testing until your dog perks up. You will then know you have reached a frequency he can hear. Use the dog whistle with varying sequences to train your dog. For example, one long burst can mean "come", while a series of short, staccato bursts might mean "sit". Keep your whistle commands consistent and your dog will always know what you expect of him. Perfect gift for your dog or cat this year. Note:- Its adjustable as per your requirement, and its to train dogs. its for trainners