Dog Whistle to Stop Barking with Adjustable High Pitched Frequency from PetVitalix for Obedience, Repellent Effect and Clicker Teaching with Keychain, Necklace, Anti Lost Pet ID Tag, Training Guides INDIVIDUALLY TUNABLE - Easy adjustable to multiple frequencies to train your dog commands like come, sit, stay, etc. and discipline over either short or long distances. Use it as deterrent or bark control device. Every canine is likely to respond at a different sound, simply find best tone and tighten the nut for your pets perfect audio level. Absolutely safe for your dogs ears! PLEASE READ our included "Whistle Instruction Guide" pdf Ebook Download for all tips and finding the correct pitch. FAR REACHING - Works great for calling dogs from far away! Get your dog's attention right away without straining your vocal voice and drawing attention to yourself by jumping around like a maniac. Specially suitable for all dogs, any age, puppy and adult, Border Collie, Sheep, Hunting, Gun Dogs, Labrador Retriever, German Shepherds, Bulldogs, Beagles, Terriers, Poodles, Boxers, Rottweiler, Dachshunds, Huskies, etc. SPECIAL 2 TONE FREQUENCY: Humans will always hear a tone by blowing the whistle but your dog will hear 2 different tones. (1) Silent ultrasonic tones are inaudible to humans but very audible to dogs and so different to all sounds in the surrounding area regardless of where you are. (2) The secondary tones are audible to the human ear but essential for gauging the efficiency distinguishing long and short whistles to train your dog. SMALL AND LIGHTWEIGHT - Only 2 inches long and 0.4 ounces, perfectly to hang on your key ring to have it by your side all time or use it with our included lanyard. Nice looking silver repeller fitting in each pocket. Set includes an additional ID tag as gift for your dog, cat or other pet animal. 100% WORRY FREE GUARANTEE - We fully stand behind our new product with our Risk Free Guarantee, if there is any problem with your product we refund your money or ship you another brand new unit FREE of charge!