BOSHEL Dog Training Whistle Ultrasonic Whistle to Stop Dog Barking - Teach Commands - Discipline - Adjustable Pitch - Stainless Steel -Small and Lightweight - Key Chain Attached- By trade; SILENCE BARKING WITH A SINGLE WHISTLE! Ultrasonic pitch quiets dogs but can't be heard by humans TRAIN EVEN STUBBORN DOGS Use the whistle to reinforce commands, break bad habits & ensure compliance READY TO TRAVEL Use the key ring to carry it with you, so you can correct behavior anywhere you go FULLY ADJUSTABLE Twist to tailor the pitch to your dog's hearing for best results BUILT TO LAST Made from heavy-duty stainless steel metal to stand the test of time