Item Type: Cat Self Rotating Ball Material: ABS Diameter: Approx. 6.5cm/2.6in Weight: Approx. 111.0g/3.9oz Battery Type: Ni-MH Battery(Include) Battery Capacity: 40mAh Package List 1 x Cat Self Rotating Ball 6 x Button Batterie 1When encountering wall or corner resistance, it can automatically move irregularly and change direction on its own, interactive toy. 2Easy to use, just press the button on the surface, the toy ball can easily become an exerciser for indoor cat training. 3As an electronic toy, you only need to install 3 LR44 button batteries to work, we provide you with 6 LR44 button batteries. 4It is made of nontoxic ABS material, which can ensure safe biting and licking. It is designed as a round hard shell and is suitable for all kinds of cats. 5Through the external ON/OFF button, the cat ball will start to rotate 360 degrees and attract your pet's attention to chasing and running. 6It can help cats and dogs to exercise more indoors, improve the body's immunity, reduce obesity, and eliminate boredom when the owner is away.