Usage Tips:AMAZING BARK CONTROL - High frequency dog training whistle is a useful tool to control dogs excessive barking. Dog whistles are very popular to train your dog without hurting your pet through shocks and other means. Its ultrasonic sound is effective to stop barking and also harmless for dogs. When you blow your dog whistle, your dog would immediately stop barking after training.ADJUSTABLE PITCH - An Adjustable pitch frequency whistle is a great way to teach your dog commands. Dogs can't hear all frequencies, but the ultrasonic dog whistle is adjustable to fine tune the proper frequency to get your pet dog to respond. The sound will not annoyed you and who is around you, it is an ultra-sonic sound that is fit dogs well.EASY TRAINING - -take control of your dog : train your dog to follow instruction, sit, come, stop barking, stay and more. Impact discipline and personally control your dog by issuing sequences that only he/she understand, regardless of their age, gender or breed. Enjoy complete training freedom with Poodles, Border Collies, Sheep, Gun Dogs, German Shepherds, Bulldogs, Terriers, Rottweilers, Dachshunds, Huskies, HuntiANTI-LOSS AND SAFE DOG WHISTLE - dual anti loss features with special lock nut cover with free lanyard. Never worry about the loss or misplace of the dog whistle, bring it to anywhere youd love to. Our dog whistle designed reasonable small size and made of premium stainless steel material, convenient to have it and long lifespan. Whistle sound is not so clearly for humane but is enough for dog.