Built-in touch sensor. When your cat touches the toy it will automatically move, swing and make a sound, attracting your cat to play with it. You can charge it with the included USB cable. Filled with organically-grown catnip, 100% catnip inside. The catnip has a strong aromatic fragrance that stimulates your cat to play. Made of quality plush fabric, stuffed with pp cotton. Soft and comfortable, non toxic and safe. Your cat will love it!