Features: Pet training Clickers and whistle combo. Can be used to train basic small trick, and correct the bad behavior; Scientific training safely and easily.The Clickers with whistle is very loud, you can use outdoor. Train quickly just by simply press the clickers and command. Big button for easy clicking and loud sound. Its tiny size and wrist keyring allows you to carry it everywhere, ensuring consistent training regardless of the location. Specifications: Material: Plastic Color: 2 Option Size: As Shows Package Includes: 1 Set Pet Training Tool note: 1.Please allow 1-2cm errors due to manual measurement, note that you donot mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.