HOD HEALTH AND HOME Australia has been operating online and instore for 8 years. All products come with a 1 year warranty, fast shipping and special offers added to our site daily.. Need more than 1? Get a bulk buy discount up to 20% off Dog Whistles Allow You To Easily Teach Your Dog/Puppy Unlimited Commands Such As Stop Barking Sit Come Lay Down Stay And More. Different Dogs Respond To Different Frequencies. Our Dog Training Whistle Has A Nut And Screw That Would Adjust The Frequency When Turned It Is The Right Dog Whistle To Stop Barking Which You Want To Have. Made Of Safe Doesn Ft Hurt Or Bother The Dog It Just Grabs Him Attention And He Stops The Annoying Barking. The Dog Whistles Is Small And Light Weight You Can Take It With You To Everywhere. The Voice Of The Dog Whistles Are Not To Be Silent Just The Voice Is Quieter. Many People Can Not Hear The Sound Of This Whistle Clearly But The Dogs Can .Don't Worry About It.