Adjustable Frequencies: Different dogs respond to different frequencies. Our dog training whistle features a nut and screw mechanism that allows frequency adjustment when rotated. Observe your dog's reaction to each setting to determine the most effective frequency. Easy Dog Training: This whistle is a helpful tool for teaching obedience and basic skills. Use the ultrasonic sound to train your dog without raising your voice. Effective Dog Training: The whistle can be heard by your pet up to 25 meters away, even when out of sight. Use distinct commands to guide your dog’s behavior, such as Sit, Paw, Lay Down, Up, and Heel. Anti-Lost Design: The whistle is constructed with stainless steel and includes a protective cover to resist dirt and damage. It comes with a black lanyard for convenient neck carry, reducing the risk of loss. Note: This training whistle requires consistent use and multiple training sessions for your dog to respond reliably. Use positive reinforcement techniques to encourage listening and obedience. Best results are typically seen when training dogs between 3 and 7 months of age. Number of Pieces Delivered: 2 Color: Black Size: Whistle 8 x 0.7 cm; Cord 49 cm