Features: Safety Dog Training Whistle: Our dog training whistle helps to training your pet dog stop-barking, safety ultrasonic whistle designed specifically for pets, highly effective in training your furry friend. Adjustable Frequencies: The dogs whistle designed ultrasonic frequencies to ensure no danger of harming your dog hearing, adjustable frequencies to setting the appropriate frequency until your dog exhibits strongest reaction, helpful in your dog training. Highly Effective: The dogs training whistle ultrasonic can up to 1.2miles, Whether you are teaching your dog basic commands or advanced trick, this whistle is an essential & effective tool for positive reinforcement training. Easy to Use: The dogs whistle is easy to use, please keep your whistle command consistently and multiple & repeatably practicing. Each-time your dog reaction is right, give him reward, approach to make your dog a obedient friend. Selected Material: The dogs whistle is made from selected metal material, non-rust, durable and long-lasting, lightweight and portable to carry with you link with lanyard. Specifications: Material: Metal, Plastic Product Dimension: Approx. length 8cm/3.15inch Color Option: Black/White-/Blue/Red/Green/Orange Package Includes: 1 x Dog Training Whistle note: Please allow 1-2cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.