1、When encountering wall or corner resistance, it can automatically move irregularly and change direction on its own, interactive toy. 2、Easy to use, just press the button on the surface, the toy ball can easily become an exerciser for indoor cat training. 3、As an electronic toy, you only need to install 3 LR44 button batteries to work, we provide you with 6 LR44 button batteries. 4、It is made of non‑toxic 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. 5、Through the external ON/OFF button, the cat ball will start to rotate 360 degrees and attract your pet's attention to chasing and running. 6、It can help cats and dogs to exercise more indoors, improve the body's immunity, reduce obesity, and eliminate boredom when the owner is away. 1 x Cat Self Rotating Ball6 x Button Batterie Item Type: Cat Self Rotating BallMaterial: ABSDiameter: Approx.  6.5cm/ 2.6inWeight: Approx. 111.0g/ 3.9ozBattery Type: Ni-MH Battery(Include)Battery Capacity: 40mAhVoltage: 1.2V