1. Intelligent Ball Toy for Cats. Built-in sensitivity trigger produces a simulated animal sound when the cat's paw lightly touches the toy. It is easy to attract your cat's attention. Lightweight, easy to carry for indoor and outdoor activities to have fun playing with your cats. 2. Sounds animal sound simulations. The interactive toys for cats have been built into a battery. They can produce 3 lifelike animal sounds such as frog, cricket and bird chirping. The animal sounds occur when your cats touch the scratching and hit the balls. The natural animal sounds make your cats very happy and excited when they play with them. Each ball in the battery can be used 10000 times sounds for life."