PROFESSIONAL DOG WHISTLE : You can adjust the pitch to get the right frequencies, loosen the sonic adjustment screw while blowing the air in from the air inlet, turn the adjustment lever to adjust to the optimum pitch. After the adjustment lever is turned, tighten the sonic adjustment screw. This dog whistle can be used on any common breed of dog. SAFE DOG WHISTLE: Our dog whistle is made of safe high-quality stainless steel, training your dog without any health concerns, it doesn't hurt your dog's hearing during training sessions, please to know you will hear the sound too.ANTI-LOSS WHISTLE: The dog whistle body is crafted with stainless steel coated with a protective lid to prevent dirt, damage, and accidental loss. It is extremely easy to wear around your neck with our matching black lanyard.EFFECTIVE DOG TRAINING: You can easily teach your dog unlimited commands by adjusting the different ultrasonic frequencies. Please keep your whistle command consistent, when your dog does it right, give him a snack reward, approach to make your dog a listening and obedient friend. ENJOY DOG TRAINING : Your pet can hear the dog whistle up to 25 meters away even if they can't see you! complete training freedom with poodles, sheep, rottweilers, huskies, and other breeds. Dog whistles can ensure that they obey basic skills, like sit, paw, lay down, up.