【Adjustable Frequency】 The precision of the whistle allows for a finer frequency range, barely audible to humans but very good for dogs. The frequency lock maintains the set frequency so that the tone your dog gets used to does not vary. 【Ultrasonic Training Whistle】 Our dog whistle reliably stops barking and helps with learning commands and tricks. Suitable for sports, hunting, herding, guide dogs, and rescue dogs. The dog is man's best friend. We will strengthen the relationship between you and your four-legged friend. 【Dog Whistle with Lanyard】 The high-quality lanyard prevents the dog whistle from being lost. Thanks to the included carabiner, the whistle can be removed from the lanyard at any time. Our premium whistle combines lightweight and comfort. 【Command is Command】 The dog can clearly distinguish the ultrasonic waves emitted by its flute, and the owner can use it to blow different sounds and give instructions. We will strengthen the relationship between you and your four-legged friend. 【Good Friends of Humanity】 Dogs can understand us, but they don't comment. We can train the dog to do some basic movements to improve the relationship between the person and the dog. With this whistle, you can train your dog easily. <b>Product Information</b> Product Name: Ultrasonic Dog Flute. Specifications: Total length (including the iron ring on the head) 9CM, flute length 8CM After the lanyard is folded, the length is 42cm and the width is 1.5cm. Material: Stainless Steel Weight: About 25g/piece with lanyard Color: Black Delivery Quantity: 3 pieces <b>hear it. How to Use:</b> Step 1: Loosen the sonic adjustment screw. Step 2: Turn the adjustment lever while blowing air into the air inlet to adjust the optimal pitch. Step 3: After turning the adjustment lever, tighten the sound adjustment screw. <b>What do you get?</b> Dog Whistle with Whistle * 3