Detail of the electronic cat toy: Stable base: The plate base of our cat toys has four non-slip mats, which makes them stable and not easy to be knocked over by cats. And you can disassemble and clean it completely. QUIET OPERATION - Noise reduction technology makes cat’s playtime quiet. The top springs rotate randomly and move irregularly with clockwise and counterclockwise circles. Specifications Specifications: Size: disc diameter 17 cm, height 18 cm Material: ABS material Weight: 475 g Instructions for use Open the battery box. Insert 2 AAA batteries into the battery box (battery not included). Place the product on a flat surface and press the on/off button to start.