Features: ?Sturdy Material?The whistle is made of brass material, featuring high hardness, wear-resistant, scratch-resistant, durable. Mouthpiece polished smooth, delicate texture, will not scratch your mouth. ?Dog Training?Adjustable frequencies dog whistles suitable for training pet dogs, carrier pigeons, hunting dogs, etc. You blow different sounds, so that the dog can read your meaning according to the sound, so as to make some actions. ?Adjustable Sound?Ultrasonic pet training whistles has an adjustable screw, loosen the screw, and blow air from the air inlet while rotating the adjustment lever to adjust to a suitable tone. After the adjustment rod is screwed, tighten the sonic adjustment screw. ?High Frenquency Ultrasound?Dog whistle set with lanyard has high-frequency ultrasonic waves with an effective distance of 120 kHz. The hearing of dogs is far better than that of humans. Description: 1. Whistle is (length x width x keyring diameter) about 5.5 x 0.8 x 1.5cm/2.17 x 0.31 x 0.59inch, non-slip texture, easy to grip. 2. The brass material can make the whistle emit better and stronger ultrasonic waves, and its sound is so loud that dogs can hear it within 500 meters. 3. By rotating the screw, the size of the internal space of the whistle can be changed to adjust the volume. The WIde nut prevents the screw from loosening. Specifications: Color: silver whistle, black lanyard Material: brass Size: (length x width x keyring diameter)about 5.5 x 0.8 x 1.5cm/2.17 x 0.31 x 0.59inch Lanyard length: about 46cm/18.11inch Package Includes: 3pcs x Dog whistle 3pcs x Lanyard Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.?High Frenquency Ultrasound?Dog whistle set with lanyard has high-frequency ultrasonic waves with an effective distance of 120 kHz. The hearing of dogs is far better than that of humans. It can resolve extremely small and high-frequency sounds, and can distinguish sounds within a radius of 1 kilometer. ?What You Will Get?You will receive 3pcs whistle and 3pcs lanyard, enough to meet your daily training needs. With the lanyard, you can hang the whistle around your neck to prevent it from being lost. ?Adjustable Sound?Ultrasonic pet training whistles has an adjustable screw, loosen the screw, and blow air from the air inlet while rotating the adjustment lever to adjust to a suitable tone. After the adjustment rod is screwed, tighten the sonic adjustment screw. ?Dog Training?Adjustable frequencies dog whistles suitable for training pet dogs, carrier pigeons, hunting dogs, etc. You blow different sounds, so that the dog can read your meaning according to the sound, so as to make some actions. ?Sturdy Material?The whistle is made of brass material, featuring high hardness, wear-resistant, scratch-resistant, durable. Mouthpiece polished smooth, delicate texture, will not scratch your mouth.