Specifications: A dog training whistle can be an effective tool for teaching your dog to follow your commands, such as calling him to you, sitting or going in a new direction. The whistle can produce an ultra-sonic sound that is easier for dogs to hear. It takes a little bit of time, patience and practice, but your dog will learn to obey you through various whistle commands. Instructions: 1. Adjust the pitch & blow the whistle to your dog. Even dogs can′t hear all frequencies. Wait until he is asleep and gently blow on the whistle. Your whistle has a nut and screw that adjust the frequency when turned. Continue testing until your dog perks up. You will then know you have reached a frequency he can hear. 2. Use the dog whistle with varying sequences to train your dog. For example, one long burst can mean "come", while a series of short, staccato bursts might mean "sit". 3. Keep your whistle commands consistent and your dog will always know what you expect of him. The dog′s behavior according to your instruction need to be trained. Such as, at meal time, blow on the whistle before they get the food. It will only take a few times of doing this and your dog will react quickly. Type: Dog Whistle Material: Alloy Total Length: 56.5cm/22.24" (Approx.) Whistle Size: 8cm x 0.9cm x 0.9cm/3.15" x 0.35" x 0.35" (Not Count The Strap and The Link Length) (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Dog Whistle with Strap A dog training whistle can be an effective tool for teaching your dog to follow your commands, such as calling him to you, sitting or going in a new direction. The whistle can produce an ultra-sonic sound that is easier for dogs to hear. It takes a little bit of time, patience and practice, but your dog will learn to obey you through various whistle commands.