TOOGOO(R) 2pcs 90mm Pet Dog Puppy Training Whistle Pitch Adjustable UltraSonic Sound Silent This Dog Training Whistle is designed for dog training, the frequency produced isn't of effect on person, but very useful for dogs, it will sit up, come here, eat, sit down etc A plastic sleeve protects the adjustment area Great for recall over long distances Key ring loop included Specifications:Original box: NO