Ultrasonic Dog Training Whistle Pet Dog Supplies Silver Ear: 12x8 cm/4.7x3 inches EASY DOG TRAINING STARS - Adjustable dog whistle frequencies allow you to easily teach your dog/ puppy an unlimited number of commands such as stop barking, sit down, come, lie down, stay and more CONVENIENT TO CARRY – small and lightweight, you can take it anywhere with you ADJUSTABLE FREQUENCIES - Different dogs respond to different frequencies Our dog whistle has a nut and screw that when turned adjust the frequency TIPS - The voice of the dog whistle is not meant to be quiet, only the voice is quieter many people do not hear this whistle clearly, BUT DOGS MAY NOT care SAFE TRAINING - Made of SAFE & PREMIUM MATERIAL, does not hurt or disturb the dog, simply attracts his attention and stops annoying barking - Inner mesh panties Material: copper metal Length: about 5,5 cm/2,2 inch The package includes: 1 piece dog whistle