Product material: high quality copper + nylon lanyard Product size: whistle 8*0.7cm; lanyard 49cm (including hook) High Quality Environmentally Friendly Dog Whistle: The simple and natural ultrasonic dog barking whistle is made of stainless steel and comes with a protective cover to prevent dust, damage and accidental loss. Dog whistles are carefully designed to be cruelty-free and tested to keep your pet safe. Ultrasonic Dog Whistle: Different dogs react differently at different frequencies. Our dog whistle has a nut and screw to adjust the frequency of rotation. Pay attention to your dog's reaction to each setting until your dog shows the strongest reaction. Best Dog Training Whistle: This ultrasonic dog whistle is a great training aid for dogs of any age. It ensures your dog hears clear signals and commands everywhere, and you can keep him focused during training Have your dog follow instructions to stop barking, sit, come, lie down and potty train. Anti-Lost Whistle: You will get a pair of matching braided rope straps with our dog whistle, allowing you to easily hang the dog training whistle around your neck to prevent you from losing the whistle. Package Contents: 2*Dog Whistle Note: 1. Please allow a little error due to manual measurement. Please make sure you don't mind before bidding. 2. Color may vary due to different monitors, please understand. Hello, please pay attention to your delivery address when purchasing products. If your delivery information (such as name, street, house number, doorbell/mailbox without name, etc.) is incorrect, the order will not be delivered correctly. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.