Catit Senses 2.0 Wave Circuit Cat ToysCatit Senses 2. 0 Wave Circuit Cat Toys The Wave circuit offers elevation, for more diverse movements. 10" 25cm longerCreate open layouts. To keep your cat interested, you need to change their toy set up often. The Senses 2. 0 Circuits can be built and rebuilt into different shapes around the house. Surprise your cat with a new layout every few days to keep the experience fresh and exciting!