Feature: 1. Designed to train pigeons to enter the shed, used when the young birds return home and feed in the shed. 2. Made of high‑quality stainless steel, sturdy, anti‑corrosion and durable, which can be used for a long time. 3. All finishes are non‑toxic, safe and eco‑friendly, harmless to health, safe for you and your children to use. 4. The stylish appearance design makes it an excellent decoration for you. Loud voice and convenient use. 5. Compact size, lightweight and portable, this whistle is easy to carry and store. Specification: Item Type: Ultrasonic Whistle Material:Stainless Steel Weight: Approx. 26g/0.9oz Size: Approx. 5.26 x 0.5 x 0.5cm/2.1 x 0.2 x 0.2in . Package List: 2 x Ultrasonic Whistle Note: 1. Please allow 0‑2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.