Features: 1.METAL HANGING RING: Dog training whistle has a metal hanging ring, sturdy and not easy to fall, but also can be used as a charm. 2.ADJUSTABLE SOUND: Dog whistle mouth after careful polishing, fine texture, adjustable sound. 3.WITH LANYARD: Silent dog whistle with lanyard design, free your hands, you can wear it on the neck, very convenient. 4.ULTRASONIC: Dog adjustable whistle uses ultrasonic waves, which is harmless to your dog's hearing and is suitable for teaching your dog some basic skills. 5.LIGHTWEIGHT AND CONVENIENT: Ultrasonic dog whistle is simple in shape, small in size and light in weight, with a clear and loud sound. Specification: Item Type: Dog Training Whistle Material: Eco Friendly Plastic, Copper Nickel Plating Specifications: 2 Whistle and 2 Lanyard Color: Black Product Size: Whistle Approx. 8x0.8cm/3.1x0.3in, Lanyard Length Approx. 42cm/16.5in Product Use: Pet Training, Dog Training Whistle PackageList: 2 x Whistles 2 xLanyard Note All data are measured manually, and there are certain errors in the measurement results.