The dog training whistle can adjust various frequencies, including audible and silent modes. A dog whistle suitable for all dog breeds, including Labrador Retrievers, Scots, Golden Retrievers, German Shepherds, and Beagle. The propagation distance of ultrasound can reach 30 meters. After training, even if the dog is not in your field of vision, it can still make corresponding movements based on your whistle (sit down, stomp its feet, lie down, stand up, treat).