Automatic moving ball + classic mice cat toy + nature feather Kitten toys in pack, Tie electric ball with plush mice or feather. Activated ball pull feather tail, mice irregular moving like real wildlife , Stir cat's hunting instincts, making fabulously enjoyment.Design in motion sensor detecting Cat interact with ball, Cat ball automatic rolling & moving and stop. Cats play toy to wake up ball moving. No more trouble you switch toy on-off again and again. Upgrade to rechargeable battery inside by USB charging cable as accessory. No need paid extra money to buy battery.