XUEMEI Dog Bark Control Whistle - Dogs Training Deterrent Whistle. FEATURES Adjustable Pitch Simply Tightens or Loosen the Screw to Work out Your Dog's Frequency It Should Be Noted That This Whistle is Audible to the Human Ear Essential for Gauging Its Efficiency 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 The Dog's Behaviour According to Your Instruction Needs to Be Trained Such As at Mealtime Blow on the Whistle Before They Get the Food It Will Only Take a Few Times of Doing This and Your Dog Will React QuicklySpecifications - New - Suitable for all dogs - Easy blowing - high pitch dog whistle - Highest pitch in the Dog Whistle Class - No cork ball so it produces a solid tone Size 7cm x 0.7cm Category: Pet Training Clickers Treat Dispensers Delivery Quantity: 6 Pieces Finished color: random color