The whistle is adjustable frequencies, help train dog basic obedience and tricks, while correcting bad behavior, easily teach your dog unlimited commands such as sit, come, stop barking, stay, and more. lightweight silent bark control for dogs of all sizes and breeds. The soundboard comes with elastic wrist straps to prevent them from being dropped. Button presses easily and comes right back up without getting stuck. New Dual Anti Loss Features with Special Lock Nut & Cover with Free Lanyard. Frequency can be adjusted at will Long Propagation distance and strong penetration Comfortable and smooth mouthpiece Smooth voice and beautiful shape. Exquisite sonic adjustment screw Easy to operate and durable. HOW TO USE Use the dog whistle with varying sequences to train your dog. For example, one long burst can mean "come", while a series of short, staccato bursts might mean "sit". Keep your whistle commands consistent and your dog will always know what you expect of him. This whistle does not blow like a normal whistle. It sounds different (ultrasonic sound) , which a pet can hear properly .This product is to give command to the pet while training. First you need to train your pet , then they will react on whistle according to the training.