A ball for cats♪ It rolls automatically just by pressing the switch♪ It can be easily charged via USB. You can play with it for a long time without worrying about batteries~ When you turn it on, a blue light also rotates, so it's easy to see even at night. ( ´∀｀)b I bought it with excitement for my cat, but maybe because she's already an adult, she doesn't play with it at all~(T△T) So, thank you~