Dog whistle,Escolite training clicker silent repeller ultrasonic silver copper pets supplies (Blue) This ultrasonic sound dog whistle is designed for dog training,the frequency produced isn't of effect on person,Ideal for summoning your pet without disturbing the neighbor. Exquisitely crafted leather and durable steel product materials: pure copper body,high-grade PU leather and lobster clasp for dog whistle lanyard,U-shapped ring that prevent swallowed and screw thread non-slip design. Ultrasonic high-frequency range designed for dog hearing,it is small and easy to carry and using,train your dog to Sit down,Jump,come here,eat etc,also be used for training eagles and pigeon call. Dog whistles training your dog to come back even it is far from you,great for recall over long distances (direction and strength of wind may affect the distance). Use to effectively discipline,command,train,and interact with pets to inculcate good behavior and develop helpful skills,produces sound that is audible to dogs yet soft to the human ear;