Fusion Pet Supplies - Dog Whistle - Best Obedience Training and Bark Stopper Control Device - Adjustable Frequencies Train Your Dog To Stop Barking Or Use To Silence The Constant Barking Of The Neighbors Dog. Teach Your Dog To Sit, Come, And Other Similar Commands By Using Different Whistle Blowing Patterns. Works Great On Most Dogs If Given Time To Learn And Adjust To New Type Of Training. Please Be Patient And Consistent When Attempting To Teach Your Pet New Commands With This Whistle. Adjusts To Different Frequencies To Be Able To Find The One That Your Dog Responds Best To. This Is Not A Silent Whistle And Can Be Heard By The Human Ear. Free Guide to a Healthy Dog included - Fusion Pet Supplies Stands Behind Our Products And Offers A 100% Satisfaction Guarantee