Material: Stainless SteelItem Type: Dog Trainning WhistleFeatures:1. Designed for dog training， the frequency produced isn't of effect on person， it will sit up， come here， eat， sit down etc.2. Call your dog to come back ， dogs hear whistle from up to 20000 inch away (direction and strength of wind may affect the distance).3. Dog whistle is also suitable for other pets， such as eagles， doves.Package include:1 x Dog Training Whistles