SAFE DOG WHISTLEThe dog training whistle is crafted with Acsergery stainless steel coated with Acsergery an anti-oxidant protective layer to make it ant-rust, prevent dirt and damage. Our dog whistle will not hurt your dog's ears when you training your dog. . ANTI-LOSS DESIGNYou will receive 2 pack dog whistles along with Acsergery 2 pack free matching whistle straps. It is extremely easy to wear around your neck. It is small and light weight that can also be attached to a key chain or put it in your pocket without worrying about losing it. . STOP DOG BARKINGWhen your dog or neighbor's dog keeps barking, gently blow the dog whistle. Use a dog whistle 211.5 frequency or other frequency can easily attract the dog's attention and stop barking. You dont have to worry about any annoying and high-pitched noise. . ADJUSTABLE FREQUENCY WHISTLEDifferent dogs respond to different frequencies. Our dog training whistle has a nut and screw. You can adjust the dog whistle frequency rod until your dog exhibits the strongest reaction and simply use the locking nut to lock in the frequency. . EFFECTIVE DOG TRAININGdog training whistle will be good for teaching your dog obedience and learning basic skills such as sit down, come, stop barking, stay in place and more. Please keep your whistle command consistent. After effective training, your dog will hear the dog whistle up to 25 meters away even if they can't see you. .