DOG WHISTLE TRAINING TOOLS With adjustable frequency, dog train whistle can help you communicate with your dog in a more efficient way.Choose these mini but practical dog whistles to form your dog’s conditioned reflex behavior such as stop barking,sit,lay down,come,stay and so on.This ultrasonic dog training whistle will not hurt your dog's hearing, and the material is also harmless to human. FULL DOG TRAININT SET Pack of 2 silent dog whistle,connected with long rope to prevent getting lost.Black and white colors pet whistle tracker would be the perfect pet training accessories and tools! TINY SIZE FOR EASY CARRY Tiny size,simple but classic design.You can set this cute pet whistle in your bag or just in pocket.Very easy to carry out for dog walking or having fun outside. HIGH FREQUENCY ULTRASONIC Pets can hear up to 200 meters away even if they can't see you. It's a professional dog whistle tracker that prevents dog from getting lost! TRAIN YOUR DOG IN A MORE EFFECTIVE WAY