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 new 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 annoy you or those around you; it is an ultrasonic sound that works well for dogs. EASY TRAINING - Take control of your dog: train your dog to follow instruction, sit, come, stop barking, stay, and more. Implement discipline and personally control your dog by issuing sequences that only he or she understands, regardless of their age, gender, or breed. Enjoy complete training freedom with Poodles, Border Collies, Sheep Dogs, Gun Dogs, German Shepherds, Bulldogs, Terriers, Rottweilers, Dachshunds, Huskies, Hounds. ANTI-LOSS AND SAFE DOG WHISTLE - New dual anti-loss features with special lock nut and cover, with free lanyard. Never worry about losing or misplacing the dog whistle; bring it anywhere you'd like. Our dog whistle is designed with a compact size and made of premium stainless steel material, convenient to carry and long-lasting. The whistle sound may not be clearly heard by humans but is sufficient for dogs.