Luckey Friend Two-tone Ultrasonic Flute Dog Whistle Keychain for Pet Training This Dog Training Whistle is designed for dog training, the frequency produced isn't of effect on person, but very useful for dogs, it will sit up, come here, eat, sit down etc. Unique sound and frequency, very suitable for liontamer dog, cooeeing, eagle animal. Material: Stainless steel Size: length 8cm, Width 0.9cm Color: Silver + Black,Weight:15g