Ultrasonic Dog Whistle for Training and Recall – Lightweight, Portable, Durable, Key Ring Attachment – Available in Multiple ColorsEffective Dog Training with Ultrasonic Whistle This ultrasonic dog whistle is designed for effective training without disturbing others. It emits a frequency that is clear to dogs but barely audible to humans, making it perfect for obedience training and recall. Why Choose Our Ultrasonic Dog Training Whistle? Ultrasonic Frequency: Emits a tone that is effective for commands like "come", "sit", and "stop". Convenient Key Ring: Easily attachable to your