Weight:100g Size:8cm*0.7cm Color: as shown 【Stop Barking and Gain Control】Even if when your dog is not in your field of vision, it can accurately transmit the loud ultrasound to the dog you love, it will quickly receive instructions from the owner, and the communication is more convenient and faster without shouting. 【Perfect size】with this small & high-quality whistle you will always find the optimum frequency specifically for your dog. Whether for training puppies or older dogs, the whistle works in the high-frequency range and is therefore not particularly loud for humans, but can be heard very well by dogs. 【Training Whistle】Our dog whistle training reliably stops barking and helps you learn commands and tricks. Suitable for sports, hunting, herding, guide dogs and rescue dogs.