Dog Training Whistle - Ultrasonic Herding Animal Obedience Whistles by FIDO Care TEACH COMMANDS - Improve your dogs ability to recognize commands such as sit, stay, fetch and more. STOP BARKING - Teach your pet basic obedience. Stop unwanted behavior, like barking and digging. LIGHTWEIGHT DESIGN - Compact and portable yet durable. Allows you to take it with you wherever you go. SATISFACTION GUARANTEE - Guaranteed to help with your dog training needs. ULTRASONIC SOUND - While your dog is asleep, gently blow the whistle adjusting the pitch until your dogs ear perk up.