The Mouse Miraculous owner jumps to the Jump Rope, then tosses the it into the air. The Jump Rope then surrounds the Miraculous owner like a cocoon. Once the rope unravels, the Mouse Miraculous owners legs begin to shine.
This allows the user to shrink down, as well as split into a number of equally tiny clones of themself, splitting from the originals feet as the original shrinks down to match the size of the miniature clones. The clones are very small, being near-insect size, a size that is small, even compared to the Kwamis.