UltraSonic Dog Whistle All in One Training Kit Train your dog the right way use the whistle to train your dog how to follow simple commands Silence is golden, to an extent these do make a sound when you blow on them but its unique for dogs Adjustable frequencies & prevent excessive dog barking change by twisting end screw Free ebook, premium black lanyard, dog collar light and dog clicker for better overall training 100% money back guarantee lifetime warranty