The device has a built-in button battery, and can be directly replaced when the power is exhausted, which is convenient and fast.The main body of the toy uses tumbler design, and the cat canswing irregularly back and forth when gently touching the product. No matter how the cat plays the toy will not tip over, can let the cat have a strong interest in the toy, like to play this toy.This toy can be used by cats alone, or multiple cats can be used together.