1.Auto Roll for Your Cat: HOLOYO specially designed this cute smart interactive toy ball to please your cat. Just press the button, the ball will automatically start 360 degree self-rolling and light up the red LED light to attract the cat's attention Let the cat chase the ball indoors, have fun and exercise (Note: this ball cannot roll on a soft blanket , rolling on hard floors is recommended.)2.Built-in USB Charging: The smart interactive cat ball has a rechargeable battery inside, you can charge the ball through the USB interface in the case, 2 hours of charging will give your cat 3.5 to 4 hours of entertainment and exercise time.3.Smart Change Direction: An automatic smart balance device is installed in our smart interactive cat ball. When hitting a chair, door, wall, etc., the ball will automatically change direction without extra help, so the ball can keep the cat playing without much care from you. You can do other things while the cat is playing.4.Safe and Durable Material: Our smart interactive cat ball is made of safe and non-toxic ABS plastic material. Sturdy, harmless and odorless. The USB charging port is built into the case to keep it from getting wet or bitten by cats. The built-in LED red light is soft and won't hurt the cat's eyes. Let your cat play ball carefree