http://www.amazon.com/Panic-Mouse-Un.../dp/B000YBAZ9G

Product Description
Panic Mouse Undercover Mouse moves silently; randomly speeding,
slowing and reversing direction under its durable nylon cover - the
hidden mouse skitters furtively just out of your cat's view. Provides
hours of interactive fun.Kit Includes: One Undercover Mouse electronic
cat toy, one ripstop nylon skirt and one mouse wand.Requires three AA
batteries (not included).