Feature: 1. With colorful LED lights, scroll with the ball to attract the cat's attention, make cat more enjoying. 2. Built‑in self-balancing system, will automatically change direction when encountering obstacles, do not worry about the toy stuck in the corner. 3. Adopt high quality non‑toxic ABS materials, will not do harm to cat's health, no more worry about cat's safety. 4. Built-in rechargeable battery, you can charge the ball through the USB port of the housing, and it can be used for 4 hours after full charge. 5. The built-in LED red light is soft it won't hurt the cat's eyes, and the charging port is built into the housing to prevent it from getting wet or damaged by the cat. 6. Help cats and dogs exercise more indoor, improve the body immunity during playing process. Specification: Item Type: Automatic Rolling LED BallMaterial: ABS Size: Diameter: Approx. 6.5cm/2.6in Weight: Approx.109g/ 3.8ozBattery Type: Lithium polymerBattery Capacity: 300mAhVoltage: 3.5V. Package List: 1 x Rolling LED Light Cat Ball1 x Feather1 x Bell1 x USB Cable1 x English Instruction