The new Fling-ama-String hangs on any standard door knob. It is battery-operated and can go for hours and hours. A long string is sewn to a soft, flat elastic "conveyer belt" which constantly rotates bringing the string out and then back in. Even if the string is caught, as soon as they let go the string automatically starts to rotate again and again and again! Non-stop entertainment for the amusable feline in your house. The toy has 2 speeds to satisfy the frisky or faint feline. Kittens love it! The Fling-ama-String was a Best New Products Showcase winner at the Global Pet Expo. Takes three AA batteries (not included).