CatBib Bird Saving Large with Necklace Reflector (Turquoise - Necklace) Scientifically proven to stop cats from catching all types of birds (not just songbirds) Works by interfering with the cats timing during a bird strike Does not interfere with normal day-to-day cat life. They can still run, jump, climb trees, eat, sleep, scratch and groom. Includes pearl necklace safety reflector - made of proprietary 3M material with over 500ft visibility at night / dusk Made of thin neoprene backed with nylon. To clean, wipe it off with a damp cloth or throw it in the washing machine. Hang to dry. Recommend using with a collar that has a small elastic insert (look up RC kitty clip cat collar).