Material: Environmentally Friendly Plastic + Copper-plated Nickel-plated + Nylon Lanyard Product Size: Whistle 8cm/3.15in; Lanyard 42cm/16.54in Includes: 2*whistles, 2*chains, 1*clicker, 1*poop Bag Specifications: Stop Dog Barking: When Your Dog Or Your Neighbors Dog Keeps Barking, Gently Blow The Dog Whistle, The Ultrasonic Frequency Emitted By The Dog Whistle Can Easily Attract The Dogs Attention And Stop Barking Adjustable Frequency: Different Dogs React To Different Frequencies. Our Dog Training Whistle Has A Nut And Screw That When Turned, You Can Adjust The Frequency. Pay Attention To Your Dogs Reaction To Each Setting Until Your Dog Shows The Strongest Reaction Absolutely Safe: The Dog Whistle Is Made Of 304 Stainless Steel. The Ultrasonic Frequency Attracts The Dogs Attention And Will Not Damage Their Hearing Or Cause Any Health Problems Remote Command: Ultrasonic Wave Transmission Distance Can Reach 1000 Meters. After Training, Even If The Dog Is Out Of Your Field Of Vision, The Dog Can Make Corresponding Actions (sit, Paw, Lie Down, Stand Up, Heal) According To Your Whistle. Use The Dog Whistle At Any Time To Let The Dog Come To You Without Shouting Suitable For All Dogs: The Silent Dog Whistle Is Suitable For All Dog Breeds, Including (Labrador, Scottie, Golden Retriever, German Shepherd, Beagle). You Can Get In Touch With Your Dog At Any Time Package Included: 2*Whistle 2*Chain 1*Clicker 1*Poop Bag