Item Type: Dog Training Whistle Material: Plastic Whistle Length: Approx. 9cm/3.5in Lanyard Length: Approx. 44.5cm/17.5in Weight: Approx. 24.0g/0.8oz 1Made of metal and hard plastic, compact size, excellent texture, safety, sturdiness and durability. 2Ultrasonic sound is harmless to the dog's hearing, suitable for teaching your dog to learn basic skills, like sitting, coming, stop barking, staying, etc. 3Training your dog by adjusting the nut and rod to find an effective frequency, different dogs have different reactions to different frequencies. 4To have a better training effect on puppies, you need to go through multiple training sessions, and at the same time reward positive behaviors to make your dog obedient. 5With a lanyard, you can hanging it on neck, wrist or bags, convenient for carry and storage.1 xDog Training Whistle