The Professionals Choice: This Lightweight Whistle, Allows You To Adjust The Pitch, To Suit Your Dog'S Sensitivity Or Change The Tone For Different Dogs.Adjustable Pitch: It Is Easy To Change The Pitch On The Professional Whistle, Simply Separate The 2 Parts Of The Whistle, Rotate The Nut To Adjust Pitch And Secure Both Parts Back Together.Recall Training: Whistles Are Great For Recall Training As They Help To Standardise Commands And Are Great If Different People Are Training Or Walking The Same Dog.Lightweight And Compact: Super-Light And Compact In Design, The Training Whistle Can Easily Be Slipped In A Pocket Or Treat Bag To Ensure You Always Have It To Hand. Adjustable Lanyard: The Attractive Corded Lanyard Is Fully Adjustable So You Can Secure At The Desired Length And It Is Reflective Too!