Cat-activated for hours of boredom-battling fun. The original toy that squeaks and shakes just a like a Real Mouse Capture kitty's curiosity with Jitter Mouse, scientifically developed for hours of frolicsome fun! Jitter Mouse chirps and chatters just like a real mouse to enliven your cat's natural curiosity. When batted, the mouse comes to life – shivering and quivering to dazzle and delight cats of all ages.