INCREDIBLE BARK CONTROL - High frequency dog training whistle is a useful tool to control excessive dog barking Dog whistles are very popular for training your dog without hurting your pet by shocks and other means Its ultrasonic sound is effective in stopping barking and also harmless to dogs When you whistle your dog, your dog will stop barking immediately after training ADJUSTABLE PITCH - Adjustable frequency whistle is a great way to teach your dog new commands Dogs can’t hear all frequencies, but the ultrasonic dog whistle is adjustable to fine-tune the appropriate frequency for your dog to respond The sound won’t annoy you step and who is around you, it is ultra-sonic sound that is well suited for dogs TRAINING EASY - -take control of your dog: train your dog to follow directions, sit, come, stop barking, stay and more Impact Discipline and personally control y our dog by emitting sequences that only he understands, regardless of age, sex or breed Enjoy complete training freedom