2pcs Dog Whistle for professional dog training, featuring adjustable frequencies and a lanyard for easy carrying. 【Stop Dog Barking】Gently blow the whistle to emit ultrasonic frequency, effectively attracting dogs' attention and stopping barking without harm. 【Adjustable Frequencies】Equipped with a nut and screw to adjust frequency; test different settings to find your dog's strongest reaction. 【Safe Material】Made of metal, ultrasound frequencies are safe for dogs' hearing and health. 【Remote Command】Ultrasound reaches up to 1000 meters, enabling training for actions like sit, paw, lay down, and recall without shouting. 【Suitable for All Breeds】Works for Labrador, Golden Retriever, German Shepherd, Beagle, and all dog breeds. Training tips: Use in quiet areas, adjust pitch, train 5-6 times per session, reward with treats. Color as shown in images.