Ultrasonic Dog Training Whistle includes the following features :

• Equipped with a precision tuning screw and locking nut that allows you to shift frequencies until you match your dog's unique hearing sweet spot
• Generates high-frequency sound waves that travel long distances to dogs, while remaining virtually silent and non-disruptive to humans
• Emits a powerful acoustic signal that penetrates wind, brush, and environmental noise, making it perfect for distance recall or open-field tracking
• Crafted from rustproof, premium-grade chrome-plated brass to withstand harsh outdoor weather conditions and frequent daily training routines
• Designed with a built-in heavy-duty metal keyring loop so you can easily attach it to your keys, lanyards, or training treat pouches

Material :

• Copper/brass housing

Size closed :

• Length of 6.5 cm x Width of 1.5 cm x Thickness of 0.8 cm