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If you don't want to yell your dog, a dog whistle is a good alternative choice. The ultra sound for dogs can't be heard by humans but you can also whistle it to be heard by human pets. So perfectly useful for your training.
Total length of whistle: 2.95 inches (75 mm)
Key ring: 0.94 inches (24mm) outer diameter
Material: Aluminium (silber eloxiert oder grün eloxiert)