Product description: Ultrasonic pet training dog whistle is used to train pigeons, dogs and cats. send Ultra-long sound waves, pets can hear them from three to four kilometers away Arrived, human ears can't hear product information ■Material: Environmentally friendly plastic + chrome-plated metal Type: Dog Whistle Specifications: the total length is 8cm, the diameter of the whistle is about 0.8cm Product weight: 16g Color: pink/green/blue/red/black/purple/white/orange/mustard green