Pack Acsergery Giftage Includes - An Ultrasonic Dog Whistle, A Lanyard and A Training Clickers, A Valuable Set for Dog Training. This Is A Great System Designed to Teach Your Pet Amazing Communication Skills. .Effective Pet Training - Dog Clicker with Big Button for Easy Clicking and Loud Sound, Help Train Dog Basic Obedience and Tricks, While Correcting Bad Behavior. Teach Things Like Sit, Fetch, Shake, Lie Down, and Roll Over. .Fully Adjustable Frequency - The Whistle Can Be Adjusted to Produce A Variety of Different Frequencies of Sound, Corresponding to Different Passwords, and This Product Is Suitable for Dogs of Any Age and Breed. .Easy to Use - The Soundboard Has An Elastic Spiral Telephone Line and The Other End Is A Keychain to Avoid Losing, and Lanyard Can Also Prevent Whistle from Being Lost, It Is Convenient to Free Your Hands to Interact with The Dog When Training. .Instructions - Loosen The Sonic Adjustment Screw. While Blowing The Air In from The Air Inlet, Turn The Adjustment Lever to The Pitch, and After The Adjustment Lever Is Turned, Tighten The Sound Wave Adjustment Screw. .