Quantity: 2 pieces Product material: environmentally friendly plastic + nickel-plated copper. Cord material: polyester. Product size: whistle 8 x 0.8 cm, cord 42 cm. Product weight: 16g Professional Training Whistle for Dogs: You can easily teach your dog unlimited commands by adjusting different ultrasonic frequencies. Please keep your ultrasonic dog whistle command consistent to make your dog a listening and obedient friend. Dog Whistle Silent: Our high-rise bronze dog whistle is made of safe high-grade stainless steel, training your dog without any hassle. The dog whistle flock does not harm your dog's hearing during training sessions. Adjustable frequency: dog whistles to stop barking are easy to use, just loosen the screw sound adjustment knob and turn the adjustment lever to obtain the desired ultrasonic frequency. Suitable for all dogs: Dog Whistle is a type of training tool that makes dogs come to you. It is suitable for all small or large dogs. You can get in touch with your dog at any time with the help of our silent whistle. Covering a perfect dog silent for humans: With this dog whistle to stop the neighbors dog from barking, there is no longer a need to punish pets for training. Training barking dogs in this way is easy, bringing huge changes to dogs and puppies, from slowness to great spirit, from fear to full confidence.